I'm glad he became a Christian in prison and was able to overcome his inherited criminal past. On the one hand, it's too bad he wasn't in a place to be "Scared Straight" in his youth. On the other, his experiences qualify him to express a perspective few know firsthand, though they follow closely the Hollywood stereotype where criminals are essentially glorified. Certainly, his version is interesting and does have some valid points, they just aren't the whole story, not by a long shot.
His best point is that the criminal element have it much rougher in prison, where certain subcultures naturally exist, including among prison guards, but especially among prisoners. He said it himself: To the inmates, the worst sort of prisoner—worse than paedophiles—is one who tells the warden the truth about the evils another prisoner commits. Had he taken the route of a snitch, he might not be alive today. He made it clear that such were given a death sentence, if found out. In other words, he deliberately perpetuated the subculture of the imprisoned criminal element to avoid ending up dead.
Guess what, people do the same outside of prison, perpetuating crime in their communities.