Maybe hes psychopathic and has always thought it would be fun and thrilling to do something like that. Maybe he's always fantasized about it. And with old age settling in (and maybe depression, boredom, or a "late life crisis" of sorts) maybe he felt as though he's lived his life and decided to finally go for it. Honestly I'm starting to lean more towards that as more time goes by with no real motive coming to light.
"Of course, everyone will claim they respect someone who tries to speak the truth, but in reality, this is a rare quality. Most respect those who speak truths they agree with, and their respect for the speaking only extends as far as their realm of personal agreement. It is less common, almost to the point of becoming a saintly virtue, that someone truly respects and loves the truth seeker, even when their conclusions differ wildly."
-walsh
-walsh