I have seen lots of people, myself included, where self revenge would make the most plausible explanation for behavior. I no longer see people as homogeneous or discrete.
Anger serves a useful tool, but it can also be an extremely powerful way to manipulate and be manipulated.
There is also regressive punishment, in the case where someone else has been wronged, not writing the wrong and letting it linger is also a form of self harm.
I now have the philosophy that if I were to see someone else treating someone the way one treats themselves, and they take note of it, then the internal behavior is not appropriate.
Neither will help a victim of course, but self-sabotage never help (almost by definition).