Life has a way of paying you back. If you do good deeds, that will come back to you in a thousand ways too.
Likewise abusers do get pay back. Let me give you some examples:
Ending up in prison.
People avoiding the abuser at all costs.
Even their looks change. When you do evil every single day, your looks will start to deteriorate and your face will start showing how toxic you really are.
Humiliated through being exposed. Normally these people have a huge ego and they won’t like it at all.
People becoming smarter and realizing who they are dealing with.
When you become evil, you cannot experience love, real love nor happiness. Nature pays you back.