The problem is, the leaders are very charismatic and very proficient at finding the best way to appeal to the majority, who generally when pushed, just want revenge. It's a very difficult sell to persuade, on mass, that revenge can only destroy both sides rather than protect everything they care for. "Cometh the hour cometh the man", it's no coincidence that great men/women are as rare as hen's teeth. It's just far to easy to dismiss a platitude like, "Darkness cannot drive out darkness; only light can do that. Hate cannot drive out hate: only love can do that.".