Talk:Greg Universe/@comment-24131644-20140929161447/@comment-5629290-20150209000849

He raised Steven as a baby but didn't know anything about magic so he had the Gems take Steven under their wing.

http://www.newsarama.com/23160-steven-universe-the-character-on-steven-universe-the-series.html

I get the feeling most humans, while aware of magic's existance, get really uncomfortable around it and prefer to stay away from that sort of thing. He doesn't want to interfere.