In the end, I'm super buddhist/christian about this, along the lines of Thich Nhat Hanh, the only way to heal these divisions is to listen & love, and remember that the person you're talking to is in the end your brother or sister.
I just don't think banning/yelling/scapegoating/mocking the other guy ever leads anywhere good, even if "they did it first" or "but I'm right."
But that's damn hard enough for me myself to live up to, so I don't really expect anyone else to either, or blame them for it.