People that are insane (as the Arizonia killer is said to be), people who are drunk and people high on drugs loose control and do bad things.
Why is it they never do good things? Drunks don’t go out and paint the houses of widows, nor cut their grass. The insane don’t volunteer help in Haiti.
There is evil in the human heart that comes out when they loose control. The Bible says, “For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies” (Mathew 15:19).
Wise Shakespeare recognized it and wrote, “The fault lies not in our stars, but in ourselves.” This is where the Arizonia killings originated, from the wicked heart of one mentally deranged man.
Rational, sober men are able to refrain from yielding to the evils within their hearts. When men loose control they cannot control the evil within them.