I'd like to think you're right, but there are plenty of people who seriously believe hateful or frankly stupid things. Which is to say, there are people who are

I'd like to think you're right, but there are plenty of people who seriously believe hateful or frankly stupid things. Which is to say, there are people who are proud of being racist, sexist, creationist or whatever, and services like Twitter enable them to find lots of other people who share their views. Rather than being ostracized, they get support, and that results in mobbing. The use of real names on Twitter, Facebook etc doesn't actually stop this, though I presume it moderates it somewhat. (The "secret sympathizers" may be less likely to join the mob.)