Killing things just because they're a threat isn't right or good. But this thing, specifically, it won't let you grow. So I'm going to do something that's not good, but I hope will end up good for you. But it's not something to take as an example to follow. This is a desperate measure. Maybe someone better than me would find a better way--

Maybe you'll become someone better who can find ways to do things that aren't violent or cruel. That's what I want, I think that will help you. Can you understand a little?

This isn't right but it's the option I see, and eventually you might be someone who sees even better options, that don't hurt anyone.