The speech act of yelling fire in a theater isn't what's specifically banned. Any act that recklessly provokes a riot is illegal. Same as telling a gunman to fire can be an act of murder. It's not the speech that's illegal, just what's done with it, which applies to any act. "Hate speech" is something else entirely. You're conflating in very dangerous ignorance there.
"Child" porn law's based on a blatant case of false cause. It's politicians and moral guardians playing unqualified, idiot shrinks and shouting down anyone that calls them on it, while frothing at the mouth. They'll even spout shit about "How would like your rape being shared on the internet?", despite that being perfectly legal for any other victim and despite adolescents being jailed for producing their own material... It's just rabid "kill the icky" psychosis, not anything rational. They go scorched earth on anyone not special enough. Hackers can easily destroy random people with the laws as written, much less the legislation from the bench that's actually enforced. Try it on some grandmother or a judge, and they'll get handwaved where many others would be gone already.