Well, you can keep someone away without killing them, or putting a bullet through their spine.
And you don’t do it by [apparently] trying to take out your 17 yo daughter at the same time.
Protecting your daughter and her honor are good and necessary things. I’d beat the crap out of anyone that hurt mine. That not what happened here. He wasn’t hurting the daughter, and she is old enough to know what she is doing. This wasn’t unilateral by any stretch of the imagination.
I’m seeing the kind of victimology thinking here I’d expect from libs. Poor women, too helpless and dumb at 17 to know not to play around with boys. Girls are also responsible for their actions, too.