Unfortunately thieves / criminals don't ponder that thought before committing their crimes. Maybe crime rates would go down if thieves knew if they get caught in the act, the could end up dead
I wouldn't say sorry to a parent for killing their kid that was stealing my stuff. I would tell them they did a piss poor job of raising their kid to think it's ok to steal people's property.
Do you think we should do away with attempted murder too? I mean if you didn't actually achieve the goal, but just wanted to and were in the process of doing it, it just doesn't cut it.