Anything can set off a rage killer. Gerald Eugene Stano confessed to murdering 33 women during the 1970's, while Benjamin Atkins raped and strangled 11 prostitutes.
Taylor Helzer had a plan to take on Satan and overthrow the Mormon Church. But in a twisted quest, he and his minions butchered three people and executed two others.
Control freaks seek to gain power through murder. Richard Angelo was a nurse who poisoned his patients, and Ronald Simmons killed 14 members of his own family.
Maksim Gelman stabbed random strangers throughout New York City, and Henry Lee Lucas was a barbaric necrophiliac who claims to have killed hundreds.