You know, you see a friend treating their spouse like sh!t, having A's, etc.
Do you wimp out and tell yourself it's none of your business? Not your problem? Be supportive of your "friend" no matter how disgusting the behavior?
I can truthfully say that I stepped up when a couple of friends tried to justify their ridiculous behavior to me. I called them on their excuses and the hurtful things they were doing to their partners.
It ultimately didn't stop them, but I could see they looked shocked and ashamed for a moment, and at least my values were still intact.