The truly troubling thing about an enabler is that, should they suddenly see the light and reverse course, committing themselves instead to curbing the behavior they’ve previously encouraged, it’s too late. It’s a hard pivot to make, enabler to enforcer.
Another way to put it: if you choose to befriend a bully, prepare yourself for the day she fixes you in her cross hairs. Think now what you’ll do on that day, and don’t count on any of the bully’s other victims, the ones you let get pummeled, to help you.