There is no God. You are your own god. There is no eternal law. You make your own law. The material world is all there is.
Power is what matters.
You just do it. I am the law, if you don't like it, you die. In the pre-rampage videos, Harris vowed to shoot Christians in the head. He was furious at Christians who shared their faith with others. Witnesses said he went out of his way to shoot students who were praying out loud.