I am against all forms of widespread censorship (though do feel direct censorship of the young can be beneficial for their development in some cases).
Historically censorship has lost us knowledge of our past in some places when records have been destroyed and has taken away the freedoms of some people to do things that mightn't really effect others for the worse. It has possibly lost us different aesthetics that weren't to the tastes of people in power though may have been art appreciated by others.

I do not feel that anyone else should have the right to regulate what they feel we should be exposed to as full grown adults, instead feeling governing bodies should target the sources of where some of the admittedly less desirable material comes from. And I feel the biggest danger of censorship is wondering where it will end if it picks up momentum.