There are laws regulating speech in some way or form regarding: Directly inciting violence. Threats. Various advertising and commerce standards. Specific details on how to carry out crimes. Publishing or modifying copyrighted works without permission. Photographing your ballot. Obscenity. Child pornography. Non-consensual pornography of adults. Laws enabling time and place restrictions with protests. Libel. Trade secrets. Invasion of privacy. Sedition. Various laws restricting things tending to fraud. Various national security laws. Regulations on the content of over-the-air broadcasters. Regulation and restriction of political advertising. Laws against foreign propaganda.

And probably some other things. A holistic theory for what should or shouldn't be covered has always escaped me.