the americans don't even make up excuses for their imperialism anymore do they? at least in iraq they gave us a reason, even if it was a phoned-in one.
I agree that we should reduce troop levels in the Korean peninsula- but North Korea as a regime is indefensible... I know you are not defending them, but rather disagreeing with US policy- however, I have no problem with using long range aircraft based in the US to deter North Korea from launching a nuclear attack. This is a regime which has no redeeming qualities- it treats its people like cattle, constantly threatens its neighbors, and now threatens us
north korea has been just as much threatened by america, and far more so - there's little north korea can do to seriously pose a danger to america. the u.s. military presence is massively unpopular in south korea because of the way it supported brutal fascist dictators such as syngman rhee and crushed any chance at democracy in korea in the 1940s in the form of the people's republic of korea (which despite the name wasn't communist, though it was somewhat leftist).
america also basically signalled it would do nothing to defend the south while encouraging them to keep a small military force and then intervened at the last minute at pusan, and when against north korea, looked the other way as the south korean regime massacred hundreds of thousands of communists and social democrats who were uninvolved in the action, not to mention what happened on jeju. and to top it all off? the americans wouldn't even remove the japanese administrators who had basically colonized and exploited korea for the past 30 years. in fact, they rearmed them in many cases because communism was seen as the greater threat.
i'm not defending the dprk and there's no doubt they're a militarist state, but it's worth examining why - they're scared of the americans doing what they did to iraq, libya and any other country that gets in their way.
if you want to know why the koreans resent american presence, both in the north and the south, there's a long history of it and it continues to this day.