I think the only problem there was that most people on this board could immediately see there were severe flaws in your initial complaint. For example, there are quite a lot of Americans on this forum, so of course they would want to respond when you complained about '(asshole) Americans', which might as well be any of them, and try to adress your complaint. If you talked to most of these Bay12ers face-to-face, they would probably not be fine with the things you have said, and, similarly, they are not fine with you posting them here. It is the nature of all of us to become aggravated in the presence of somebody we do not agree with, and try to shoot them down. This is probably the reason why the 'RAGE' thread was shut down as well, although I was not paying attention at the time.
Simply put, debates were almost certainly guarunteed to begin the moment you made the original post. Internet debates/arguments tend to become very hostile very quickly, although Bay12 seems to be pretty good at keeping the peace, so at the moment it's almost a countdown until a moderator takes a good look at this thread. Other threads which also regularly have debates, such as the AmeriPol thread, survive because they have better things to do than argue all the time, and because in the process of arguing about politics, one must do research and become well informed to be able to defend their point at all, which tends to lead to less flame wars (well, not necessarily, but most of the people over there seem to have an idea of what's going on at any particular time). This thread is about 'getting things off your chest', which doesn't seem like a recipe for mutual understanding or a friendly environment, seeing as we don't have to be well-informed or knowledgable to complain about things that we don't necessarily understand.