I don't think you should be killed for performances either

If you/society see the performance as beyond the pale, inciting violence then you should arrest the person and give them due process, or change the laws to reflect your beliefs

I agree. How do we stop this from happening?

You seem to implicate "you/society" as the issue, but I didn't shoot anyone. So really it's society's issue, and we're in this situation because the Overton window is so irrevocably wide. Moreso than ever before, our bipartisan system is chock-full of extremists. People who want to kill CEOs, people who want to kill politicians, people who want to kill minorities.

The ordinary response is always "well, some gun violence is tolerable" but that doesn't seem to be reflected at all in this comment section. Many people are treating this as entirely unacceptable - so, from square one, how do we want to legislate a solution?