To get them into a state where you can defend against them by manipulation through the gaslighting confusion. Sort of like the best defence is a strong offence situation.
Revenge. It's not going to happen. You cannot penetrate them the way they did you. What you should be focussed on is growing and becoming less affects by such creatures.
Because their ego is solely dependent on their opinions of themselves. No other opinion will ever matter. Where as the egos of others can be influenced by outside influence.
Yep. That's the conclusion I came to earlier in the thread. I think you are right. If you try and gaslight a psychopath, you will come off second best. Their egos are just too big.