Even claiming to understand what occurs in the mind of such a person is folly. We use rational thought process to make choices because, in large part, we value human life. I was able to speak with a LEO who was pursuing a advanced degree who interviewed several death row inmates. Their thought process is whacked in most cases. My personal belief is that there is some kind of "switch" when we choose to flip it, the rational thought process ceases to exist, for most people.

Sure, BTK, Dahmer, the Unabomber, etc. likely suffered from a different set of delusion.

The fact of life is that NO law will prevent these kinds of attacks when people have even a slight amount of "freedom".