Yes its right that a degree of censorship exists, personally I have no desire to see violence, violent images, exploitation of children etc on for example a motorcycle forum, thats not to say that they should be censored per-se but it should take into account what the viewer or reader expects or its reasonable to assume exists there. But therein lies the problem, who decides what we can and can't see and where can we see it ?
if you don't like the rules create your own little virtual world or work within the rues to change them to what you want, thats the other bit that goes with free speech, democracy...