The Fundamental difference between me and my brother

Yesterday I watched my brother wage chemical warfare on a small hive of hornets that was building under one of our deck chairs. He doused their nest, them. They fell to the deck, twitching, one or two trying to crawl away. They never saw it coming; they had been working quietly, diligently. He walked away like it wasn't anything, leaving their little insect bodies scattered. Some curled, like the Raid was eating away their intestines, if they even have those. I felt bad--I was the one who remembered it was there, who set them up--and he shrugged like he could do it for a living.