Title: Here's What Motivates Serial Killers To Kill | True Crime Magazine
Headings: 
Anger
Criminal enterprise
Financial gain
Ideology
Power or thrill
Psychosis
Sexual desire
Act-focused killers
Visionary killers
Mission-oriented killers
Process-focused killers
Hedonistic killers
Lust killers
Thrill killers
Comfort killers
Power or control killers

Content: But despite his initial euphoria, Berkowitz was still empty and unfulfilled. Ed Gein murdered women who looked like his mother prior to making his “woman suit.” He ate one of his victims to preserve his mother’s soul who he believed was living inside his body. Ed Gein’s neighbor, Bob Hill, looks on in horror while standing in the interior doorway of Gein’s house. Another example is Herbert Mullin, who killed thirteen people in California in the early 1970s. He believed that he was taking orders from God and what he did was just obeying his commandments. Mission-oriented killers
Mission-oriented killers generally aren’t psychotic. They want to make the world a better place to live according to their own attitude. They think that they need to get rid of people who shouldn’t be a part of society or even walk on the Earth along with them. They may target homosexuals, prostitutes, or people of different ethnicity or religion.