He was the closing keynote at our annual conference (Okta's Oktane) last year and it was the same way. He was open and clear about what he did, how much he regretted it, and why he did it. Fundamentally, it came down that he was young (16), scared (parents getting a divorce), and stupid. He reacted out of fear and total disregard for other people. He also talked about coming through the other side and learning what mattered and why.
I sat down in his keynote as a fan of his exploits and finished as a fan of the man himself.
Watch the Google talk.