Its not just people who are upset getting banned for being upset, its people who are attempting to burn it all down on their way out the door in protest.
I get where the protests are coming from, but the cardinal rule of online communities is "once you post it, its out there". Other people have reacted to it, replied to it, quoted it. You break not just your own content but entire discussions if you mass-delete your contributions. They stopped being exclusively yours to take back once you contributed them to a broader conversation.