This doesn't follow. I'm having a bit of trouble putting my thoughts into words here, so bear with me. It's kind of like looking at a case of a fundamentalist killing an abortion doctor, then saying "Since you think criminal behavior is somehow related to "religious fundamentalism" - which parts of "religious fundamentalism" do you want to see criminalized"? It's missing a lot of steps in between.
I think part of the point that is being missed here is that "cancel culture", no matter what you call it, encourages and opens the door to criminal behavior: threats, violence, vandalism, coercion. Those actions are already criminal, and should be dealt with appropriately. Part of the problem though is that a lot of those actions (threats and coercion) happen on line in an anonymous fashion. Even some of the RL actions have a veneer of anonymity to them - the people shooting at the cop and his family don't have a personal connection to him, they're just some rando from the internet most likely. Which makes it incredibly difficult for the police to pursue.
It's not that "cancel culture" needs to be criminalized at all. It's that it needs to be acknowledged as a behavior that increases the probability of anonymous criminal behavior, that has real world consequences for the targets including emotional trauma as well as loss of livelihood and potential violence, and that it should be discouraged.