People have been this divided for a long time. Social Media just helps exhume it better. Started in the 50s.
My (probably unpopular) opinion is that they simply shouldn't have a voice. Twitter is bad for society period.
Though it doesn't help, of course, that TwitFaceTube are designed to maximize engagement at the expense of everything else, which encourages inflammatory content. Maybe if they didn't, we wouldn't have this problem.