You'd think we would've figured this out by now.

 If it's one thing humans are incredibly good at, it's killing their fellow human beings. We don't need much of a reason most times and there's certainly not much forethought, logic, or reasoning involved before we start firing bullets and missiles, dropping bombs, and deploying deadly drones. Whether it's a lone gunman pissed off at someone or something or an entire nation pissed off at another nation or group of people; rest assured, heads will roll and bodies will drop. And when it's all said and done and there are dead and wounded everywhere, absolutely nothing will be resolved. In fact, it will only lead to more anger, misunderstanding, kneejerk reactions and, yes, more killing. Our history books are full of these accounts of man killing man whether it's revenge, holy war, or self-preservation. You'd think after seeing these killings repeated century after century after century for the same old weak and tired reasons, we'd be able to learn to stop killing; we'd be able to come up with some other way to resolve our conflicts and disagreements. Alas, it seems we enjoy it too much. The killing. And we keep developing even more expedient, lethal, and horrifying ways to kill each other. And those of us not doing the actual killing are keen to pick a side and root for one side to kill more of the other side. In all our centuries of existence, you'd think we would've figured this out by now. You don't fight hate by hating more. You don't stop senseless killings by killing more people. You don't overcome misunderstandings by refusing to listen, and you can't meet in the middle if you're continually choosing sides. Humans; the world's most invasive species.