> There are certainly hairy exceptions, like doxxing, slander, or incitement to violence

You seem to have chosen three hairy exceptions, why not four or five?

> stuff like this clearly doesn't fall in that category

Those categories?

Or are you saying that doxxing, slander and "incitement" to violence are three things that can put people into immediate danger, so the single category is "things that can put people in immediate danger"?

Are arguments that doxxing and slander are things that can put people into immediate danger any stronger than the arguments that pornography/obscenity and hate speech put people into immediate danger?

In fact, doxxing is usually extremely legal. The thing that should obviously be illegal is legal.

On the other hand, hate speech can aggravate criminal charges and obscenity is still actually illegal (while pornography isn't necessarily considered obscene any more.)

I guarantee you have a counterpart who thinks it's obvious to everyone that hate speech and pornography cause real harm, where doxxing and slander are journalism and incitement to violence is activism or self-defense.