I don't know that people necessarily improve when they get external love and support, and I don't know that everyone who's evil had a lack of love and support. But The Good Place was aiming in the right direction. Everybody's innocent in God's eyes. And whatever a person is, there are reasons for it, and reasons for those reasons, etc. We're all one, ultimately, so the only thing that separates an evil person from a good person is circumstances.