When it comes to banning and the purpose of banning, people often get it twisted. Even people who work in community management.
The purpose of banning isn’t to remove access as much as it is to curb behavior. Anyone who has been in this field for a little while knows that people can evade a ban and register another account. That’s not the primary point to banning.
The primary point is to provide a consequence for excessive and continual bad behavior. That consequence is the loss of reputation. While there is a group who won’t care, that’s a big deal for a lot of people. The desire to maintain their reputation is a powerful motivator for participating in line with the community guidelines and norms.