Telling a survivor of complex trauma to "just let the past go" is like telling someone lost in a labyrinth to "just find your way out."
We're f*ckin' trying.
Karma comes after everyone eventually. You can't get away with screwing people over your whole life. I don't care who you are. What goes around comes around. That's how it works. Sooner or later the universe will serve you the revenge that you deserve.