Censorship by the owner of a site, for his or her own reasons, is fine.
Censorship by the Government, for practically any reason, is not fine.
So, its ok for private citizens to deprive others of their amendment rights?
Whether the government tells you it is wrong or a site owner like here at FR, not because they were told, but because they knew it wasn't right, to post such things, the bottom line is the same. With free speech comes responsibility.