Earlier quoted context omitted.
Yes, /r/politics is an echo chamber. But there is an enormous difference between that and T_D. I don't ever recall seeing posts on /r/politics being stickied that called for violence, whereas that happened routinely on T_D. Your comment is not sarcastic, it is misleading, misiniformed and ultimately destructive.
BS. The only difference between the two discussion groups is that TD dropped all the pretense. I have seen the same kinds of things that are loosely defined as 'calls to violence' in both places.
That "dropping pretense" you describe carries a LOT more weight than you are giving it, in who it attracts, and the behaviors it promotes.