Not only that, they will have wives, girlfriends, and children; they may eventually have employees. You can not stop them period. They are a part of the human population. They can not be weeded out.
I would alternatively suggest to make the punishment severe and make sure bullies can't get away with it.
You don't have to deter people from engaging in bad behaviour if those people don't feel motivated to engage in those behaviours in the first place.
Narcissists just make the problem much, much worse.
If they are facing reparations like rehabilitation they got caught.
> I would alternatively suggest to make the punishment severe and make sure bullies can't get away with it.
Harsher punishments do not deter people from committing crimes [0]
I get the sentiment but if you want results you got to face the reality.
[0] https://www.amnestyusa.org/a-clear-scientific-consensus-that...