You can't outlaw "evil", or shoot everybody who's "evil". The only way to prevent evil from spreading is to actually be better than it, and to be able to prove it to the masses. something we fail to do.
Hello, m8s i strongly recommend reading this masterpiece of human philosophy. To a lot of you, this will give some spiritual peace. If anyone wishing to discuss it feel free! https://en.wikipedia.org/wiki/The_Metaphysics_of_Morals