when it comes to howard wanting to silence oj, i don't think it has anything to do with free speech. i think he's more on a rant about oj self promoting, and possibly making a profit on it while the goldmans have received very little from the civil settlement. this is my take on his take, but it seems like the fact that oj is broadcasting from nice homes, golf courses, etc, and living a nice life even after he got off murder is what bothers howard. it's not so much censoring him because of a message.
on top of that, remember, the guy is filling up airtime. it's all part of the act.