When you kill somebody's little sister with a missile, he's going to hate you forever. And the next generation will hate you even more.
'Greater love has no man than this that a man lay down his life for his friends' (Jn. 15:13). In truth if someone hears an evil saying, that is, one which harms him, and in his turn, he wants to repeat it, he must fight in order not to say it. Or if someone is taken advantage of and he bears it, without retaliation at all, then he is giving his life for his neighbor.