Colson references this in his book, Loving God, where he describes how broken up Augustine was over the pear incident, and relates it to an incident that haunted him in the same way: While serving in the Marines, he let his platoon steal from a cart vendor in Puerto Rico, just because he could.
Evil isn't just in the Hitlers of the world...
Nope. Augustine lays this out very clearly in his Confessions. Augustine was amazingly blessed by Christ. It's sad that our world dismisses the worldview Augustine brough to so many for so long because it is the correct view of the world. Jesus called his own disciples "evil" after all.