Probably because discussing internal politics is more often then not pointless on an international forum. We live here, we talk about it every week in person or on other forums, and are amidst the "issue" and thus not reliant on odd news sources since we are literally here and not going off of third hand information. We can see exactly what goes on, and how it has directly effected us. Why bother discussing it on this forum of all things, especially since the majority of the people talking in that thread can not even vote.
If everyone else though wants to talk about it too, then sure, more power to you.
It is not at all pointless to share information about politics on an international forum, quite the contrary, and through communication we might all learn from each other. Nor is it only internal politics, the US are made up of people descending from all other the World, especially Europe, and World politics of the last 70 years (including most European states being your allies) have made it an issue to most of us who has the US presidency.
As a Scandinavian and fellow World citizen I would for example personally really like to see some argumentation why you as an American would not vote for Ron Paul, who besides being a rare humanist, honest and seemingly uncorruptible, from all I've seen of him represents the constitution to the letter. I wish we had a Danish politician who represented the 'grundlov' (our constitution) so.
Also, being 'amidst' something does not necessarily lend you a clear impression of what is going on, and any citizen are nearly as reliant on whatever news sources about his/her own government as people abroad, it's not like you sit in the Oval Office or at some corporate board. Sure, to some extent you do feel the effects of laws and political decisions day-to-day (as we in Europe feel your foreign and economic policies everyday, be it recession, our politicians aping your politicians or young men coming home in bodybags) but it is nowhere like you have a direct source of information - you are even bombarded daily with news from the same six media corps who consistently bends the truth in the image of the advertisers/funders (as demonstrated by the Herman and Chomsky Propaganda Model 'the most reliable model in the social studies'). An American could easily know something about my country or government that I don't, even if I take part in society every day and follow as many different news sources as possible.
I know someone who is in the US Army - is he necessarily more informed about the atrocities that the US Army commits than I am (ie. stuff that he is not necessarily confronted with daily)? Has he necessarily read the Pentagon-leaked data on Wikileaks, or has he necessarily read the same reports, watched the same interviews or seen the same pictures that one outside the army has? It's a rhetorical question, of course. And yes, he knows more about the day-to-day business of his unit, what they eat for dinner, how it looks from the ground etc. etc. but some information has to be sought out no matter what nationality you have. But yes, certainly some do experience these things first hand but it's hardly universal, I think you will agree.
But I will of course not force anyone to take part in any discussion
Nor was my comment with ill intent towards anyone - I was merely curious why such blatant nationalists were not interested in discussing matters of state, and think it is bad for the debate that it is made up of 80% non-US citizens.
@Darkkarma, I've read Oberyn's post and agree with them for the most part, I wonder what prompts you to say otherwise.