Is censorship of offensive speech on gamefaqs "morally" sound?

InfestedAdam posted...

I have heard complaints about how liberal Facebook is and whatnot and retorts includes telling said complainers to make their own conservative version of Facebook.

While I don't think a private company should be forced to allow everything that isn't strictly illegal, it is somewhat telling that people consider it an intelligent retort to say," Go make a version that's biased for you! Scrub."