GiGi, all of the abuses you are talking about are real, and dangerous. But cancel culture arose because we really do need a revolution in moral habits and courtesy that accounts for the feelings and values of marginalized people. I say quite a bit about this here.
https://teedrockwell.medium.com/the-woke-revolution-in-moral-habits-5a9694abc46f
Yes, this is being done clumsily now, with lots of collateral damage. But it is possible to do it right. This brief article gives one recent example in which everybody won, largely because it was based on communication rather than cancelling.