"It's cancel culture."
"It's free speech."
"Don't go after them."
No.
I've said this before, and I'll say it again.
Trying to ruin someone's life over something they said years ago, inciting violence against them, trying to destroy their life over political views and opinions... is not at all the same as peacefully going after someone who celebrates, mocks, downplays, supports, and/or tries to justify people being assassinated for their political views.
You have the freedom to say whatever you want, but if you can watch people being murdered or coming close to being murdered and your reaction is to celebrate, support it, downplay it, try to justify it, wish it was successful, or anything of the sort, then you are a disgusting, inhumane, sick person who has no place in our society, no place in our schools, medical centers, universities, government institutions, or in any position elsewhere, and you absolutely deserve to get publicly shunned for it.