I wonder what it is they hope to accomplish by blocking this type of content. One could argue that what actually happens is a Streisand effect that promotes the views these companies are attempting to squash. My belief is that movements like Trump are a direct effect of overreaching censorship by the left which has essentially created a new right wing movement due to people backlashing against left wing media shaping.

In short, if the ideas are truly terrible they should be left viewable to everyone since they'll only turn people off. It's when you hide things that people become curious as to why the content is powerful enough to require censorship.