can you define incitement of violence? is there an actual definition or is it a "I know it when I see it" type thing? also, incitement or not isn't the perpetrator of violence the guilty one? ... or has that changed?

It depends on the collective judgment of the attorneys working at the Department of Justice, and the judges hearing the case. Unfortunately, the DoJ is currently under the command of a person who has a vested interest in protecting "his" people, so attention to this issue has been lacking.

> can you define incitement of violence?

No, I'm no lawyer but there is a lot of legal precedent for this, at least in my country.

This and hate speech against groups are the only limitation on free speech where I live.

If you hire a hitman, both you and the hitman are guilty. I think the same standard could apply here.