Killing in the name of yourself!

Modern day common thinking agrees widely at least when it comes to educated people with Rousseau's theory of people being turned bad by the society, otherwise we would be all good and jolly with each other all the time. A simpler point of view coming from the same theory states that there are no good or evil people by nature, only by education (may it be parental, self-induced or indirect) they turn to one of the two directions.

Not to fall back on the previous pure/bad comparison, good and evil are not simple antagonistically ways for one to lead its life. But the way of emptiness is quite simple in that regard. The masks we use for every person we encounter contain the good and the evil in them, respectively. You can be good to the people that deserve your goodness and evil who those who are trying to harm you or your close ones.

Yes, Emptiness will condone killing another human being. It will condone not turning the other cheek but crushing the source that brings harm your way. It will do even more than that. Not only that one has a duty to defend himself and his loved once, but in order to do that it is wiser to eradicate a potential danger than to just turn it away. That is nor good nor evil, it is living.

Again, following the ways of Emptiness means that we know how others really function. So it is forbidden to satisfy one pleasure if somebody else gets hurt.

Nobody is good or evil by nature. Only actions can be that, and even than it depends on which side of the story you are.