The theory that serial killers can't stop
Many detectives firmly believe that serial killers can't stop, not sure why that is, because Dennis Rader aka BTK stopped for many years before planning to kill again which led to his capture. And if a killer like Zodiac and The Original Night Stalker don't want to be caught, they can stop. Some are so sure that the only way killers like that stop are either dead or in prison.
Y'know, I could eat a peach for hours