Tall order, especially for someone who's been wronged. They rarely can find within themselves the magnanimity of spirit to approach a situation like this with the frame of mind you're describing.If you truly act out of love for not only your friends, but also of your enemies
But, I think your point is a good one and well said. What you describe puts me in mind of how shamans and other spiritual folk will put someone in their place, so to speak, with negative magic. Yes, they don't do it in a spirit of personal gain, or satisfaction. And usually this is someone whose job it is to do this kind of thing on a regular basis, someone who is responsible for upkeep of the over all energy of a group of people by correcting any imbalances, etc.
And I can see what you're saying about the right to protect oneself, but I'm guessing jaybirdblue has long since not been in actual danger of this person (?), but that he is trying to address a disturbing, hurtful incident(s) from his childhood. This seems to be soley revenge for revenge's sake, a personal vendetta.
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