I am happy knowing that Chesser was punished for trying to censor Stone and Parker's freedom of speech by threatening them and their show's writers.
Now, before we get all political and discuss the violation of the first ammendment, let me say that although everyone is entitled freedom of speech and expression, there are some limitations to that right.
Chesser's opinion while somewhat valid, violated the first ammendment because he was threatening public safety, by attempting to terrorize South Park's writers and collecting their personal information to use against them. Now, keep in mind that Matt Stone and Trey Parker weren't violating the first ammendment because in all honesty, they weren't threatening public safety or causing a disturbance and it wasn't deemed offensive enough to get to that point. Now, the only way that would be able to work is if there was a law that was tailored just for specific actions that were considered obscene and offensive, but being since it's too vague and broad, it's allowed, despite what some might feel about the show's content.
It's funny I'm bringing this up because I am taking a Law in Communications course this semester and we've discussed things like this and what it all boils down to is that Americans have the right to be offensive to a certain degree. The reason why this was more in Stone and Parker's favour is that they satirically expressed their views and opinions on censorship more than anything else.