Separate from the question of politicising BSG, Peter has some excellent remarks on identity and the human need to protect our own, even when it means resorting to the most extreme measures:

There’s something innate in humanity that causes us not to deal well with outsiders, even in the best of circumstances. Our country is, by most measures, about as inviting and open to those outside our cultural sphere as any, yet conflicts over immigration continue to erupt. For good and for ill, strong communities defend themselves, and the more put-upon, the more forcibly invaded and robbed of its identity a society feels, the more likely it is to take extreme action. Anyone who thinks an occupation of America (especially by non-humans who seemed to have some physical vulnerability) wouldn’t spur suicide attacks is kidding themselves. The rules of polite warfare go out the airlock when the basic integrity of your civilization is threatened.