@Xystus if something hurts you, you stop that happening. If people need to die to make that happen, it's a shame, but there you go.
Of course a more peaceful solution is better, but if you call for peace and the other side doesn't back down, all you can do is kill the ones attacking you, let the ones who don't attack you go peacefully, and hope they aren't going to turn into future attackers later down the line.