Conservatives and right-wingers are the only acceptable target.
Why do you think Kimmel tried to characterize the killer as MAGA? Because he can't joke about him being gay, having a troon boyfriend, being antifa, not even about being a furry. Mocking right-wingers, even if they were victims of murder is considered safe comedy
The DSA candidate for mayor in NYC recently had a big public scavenger hunt with absolutely no meaningful security. If Gavin McInnes or Ben Shapiro or Steven Crowder tried to have an event like that tomorrow, they'd need an entire company of Marines to keep anybody from being attacked.