"白人当年就是靠暴力种族灭绝印第安人，奴役黑人" -

happened all over the contenent of America, not only in US. What have Spanish done to the indigenous people in S. America?  It's equally barbarian, if not worse.  Anyway that's somewhat off the topic. I don't want to argue for the sake of argurement.

"你看欧洲，单亲，同性恋比美国盛行多了，人家谋杀率比美国低几十倍。"- Europe has much better social safety net than US.