I'm currently posting from prison. I developed psychopathic tendencies when I was a child and lashed out in strange, unpredictable ways.
My parents were rarely active in my life, and I felt abandoned and unloved-- second place to their corporate jobs and love of wealth.
I finally met with a therapist a few months ago, and he said with a fair amount of confidence that if I hadn't gone to day care I probably wouldn't have hurt all those people.
Parents be warned.