The victims of ganking produce salt that doesn't come from being repeatedly killed by a Dark Souls boss. It's a special kind of salt. "What sort of a sociopath could possibly think it was fun to blow up little old me in my unengineered and unarmed Asp in Open? Someone whose parents didn't love them, that's who!" They take it extremely personally and expend far too many mental and emotional resources coping with it and raging about it. And when the ganker just shrugs and says something like "I was roleplaying a psycho" or "The mechanics allow me to do that" or "I was bored", it confirms in the mind of the victim that their ganker is some kind of degenerate reprobate of the lowest order.
Because this behavior is intended to hurt people. I will pm you a link to a movie so you can enjoy ganker/griefer behaviour when his harmless target proved impossible to swallow