> "If murder advocacy is never beneficial, why do we need to protect it?"
If tasteless hyperbole isn't beneficial, why do we need to protect it?
If offensive comedy or idle chatter on facebook isn't beneficial, why do we need to protect it?
If pornography (which includes nudity in classic artwork to some people) isn't beneficial, why do we need to protect it?
If insulting the Prophet Mohammed isn't beneficial, why do we need to protect it?
If advocating for the overthrow of the government isn't beneficial, why do we need to protect it?
I hope you see the point here, because I'm running short on ways to explain it. I couldn't give a shit whether woodchipper-murder fantasies are a "benefit to society", and guess what? The constitution doesn't give a shit either. It's protected speech because, in the absence of a clear threat, harassment, or defamation (or espionage, etc.), we as a society have decided that it's none of our business whether your speech is "beneficial" by any criteria.