Congressional Democrats had been openly pressuring Facebook and others to take him down. Also, it is extremely idiotic to compare Breitbart with Twitter or Facebook.
I agree he's said awful things, and I think he's a terrible person. But, does that give you a right to completely silence him? Last I checked, we don't live in a Venezuelan or Russian authoritarian dictatorship.
Facebook, Apple, YouTube remove pages, podcasts from Alex Jones for hate speech, policy violations
Ben Shapiro, a very bright and moderate conservative, has been accused of being a Nazi and advocating "hate-speech" for his views on Islam and transgenders. This opens the door for major media outlets to censor him and other conservatives in a similar fashion.