There are times when people do things that hurt others just to make them do what they know is right. It is something that they do out of love, yes love. While difficult to understand at the time there can be a moment of clarity that allows us to see what we couldn't while it was happening.
The things that we do for those we love to get them to do what we know is right are many and some of them hurt them. It's a simple concept that few understand until they live it.
"I'll be the bad guy, I'll take the black eye."
Just listen to the words, it'll sink in soon enough.