Why did the US intervene in the Korean war?

(Based on a true story, the same way that Operation Repo is.)

I got this question from a friend, thought I'd share with ya'll:
http://www.bbc.co.uk/history/worldwars/coldwar/korea_hickey_01.shtml
TL;DR: They didn't - the UN did. A multi-national force composed of US, UK, Australian, New Zealand, Dutch and several other countries, was asked by the UN to go to the assistance of South Korea as it was being over-run by North Korean troops.The military effort was commanded by the American Genreal McArthur.True the US did most of the fighting, but UK and commonwealth troops fought many battles and assisted the UN operation with as much bravery as the US troops.
That, or they were training for the Vietnam War. Who knows.
But honestly, as you say, my best guess: US had some serious penis-size-related issues when politics didn't work. So, they came and shoved their dicks up them Korean mothafuckers arses...

So why would the US display such a tremendous force in a country so far away (and this is where it gets interesting, and speculations occur): To show other countries, could be for example Vietnam (hint hint, nudge nudge, know what I mean?), that the US had great military power and was capable of overcoming any obstacle on their way in religiously spreading freedom to the entire world. Remember, as the Kwar was initiated, at the same time, the US was sending military advisors to assist the french armies in Naaaam in order to help them there, before the US themselves went there in 1959 when they had had enough of the yellow-skinned tint-eyed demons slaughter and mayhem bringing bannermen. Remember, this is all post WWII when the world was trying to settle down, or some were, like Europe and the US. Europe being highly influenced by the world war with a stagnating economy, relied on US troops to do the work. Many men died in WWII, european countries had no spare warriors to send, but the US, showing up late for the 'STOP - HAMMER-HITLER-TIME'-party, didn't lose as many men or suffer the same great continous losses as many european countries.
Also, US army consisted of seasoned veterans who wanted to go to war again, and kids (read: young adults, green soldiers) who would love to go to war again, because, US have throughout history had a war for every generation to participate in.
There are MANY MANY options for why the US should MOST DEFINITELY go to war. These are all possible options. I don't know which is right, the official reason will of course be: "We care about the poor innocent people whose houses are burned to the ground, the fatherless children and the rape of women... HURR DURR." But honestly, my best guess: US had some serious penis-size-related issues when politics didn't work. So, they came and shoved their dicks up them Korean mothafuckers arses...

The Fall of The 3 Great Beliefs

Introduction
Just for good measure, a bit about my background: I'm a Dane, I live in Denmark which is a country in Northern Europe, which we like to call Scandinavia (Sweden, Finland, Norway and Denmark). When WWII had begun and Germany came to invade us (we're neighbours) it took no more than two hours before we had officially surrendered to Hitler's power. Living in 'The West' is a good and developed life with a lot of luxuries, one of them being freedom, almost too much of it. I will talk more about that, after a brief introduction on how we came to be where we are today. Starting out with...


Communism
Until 1989 the Berlin Wall and the Iron Curtain were separating West and Eastern Europe, but with the fall of the wall, the end of communism was getting closer. This process had been going on for years with communism suffering great losses, and how can one really call all people equal when there was a guy on top controlling everything. Yes I believe communism would be the ideal world, but the perfect world is and will always be utopia, it is not going to happen. Moving on, next up is nationalism...

National State
The foundation of the national state and its independance started to crumble already back in 1945 when Hitler lost his war. All over Europe people agreed that we should not let anything like this happen ever again. Without getting too much into detail, many initiatives, including what today has become the European Union, were founded to make sure of this. So far they have been succesful, well at least WWIII have not yet been started. Cross-country cooperations like the EU, UN, NATO and many others have resultet in the individual states losing their identities now that we have all become part of something bigger. Whether we want to realise it or not, no country is any longer going to war "FOR KING AND COUNTRY!" like we used to back in the old days with silver-shining knights in armor on white horses. This brings me to our next topic, something quite an amount of wars and especially Hitler's was focused on...

Religion
This particular topic seems to play a great role in todays society, at least when you turn on the TV and watch another restaurant being swarmed by shia-muslims trying to save their relatives and help the ambulances pick up the dead and injured after another terrorist attack. But up here, in the developed world, where we know that it simply can't be that one man, excuse me, a god, suddenly decided to create the Heavens and the Earth, religion is starting to fall behind. From what I understand, the churches used to be places where entire villages gathered on Sundays to listen to the words of God, and today that is no longer the case. Not even my local priestess' sons go to church regularly as she believe it is their own choice. I do not know anyone who truly believe in God except a muslim guy and even he says that it is not as much about how God (he calls him Allah though) created the Earth, "that's bullshit!", but more the whole idea that lies behind there being a greater meaning to life than what we see. My thoughts on religion in general is a topic I will save for another blog post....

So where does all this lead?
Now we have established that we are today people without limitations regarding to education, belief and wealth. Add freedom. Freedom of speech, personal freedom and freedom of freedom. My parents have never had many expectations for me regarding religion, work, education or anything except maybe a few house chores. Many people I know at my age are the same and I bet you that the generations after us will have even more opportunities to do exactly what they want to do. 
For the individual unable to choose what they want to do with their lives, they will find themselves in a position without any goals in their lives. Basically, the meaning of life. Since the meaning of life is no longer to kill all the the capitalists, and we are no longer fighting for King and Country and our parents did not teach us to believe in God, what is there left to do?
People start setting personal goals to fulfil, and when they reach those goals, they set new ones. Is this good or bad? Where do we see the consequences of this behavior? Am I right or wrong?

Oh by the way, if you want to taste the Commie Mints, you can get them here!