Agreed. If one goes with the old adage "Let the punishment fit the crime" it seems utterly incomprehensible. Long years of imprisonment for what he did.
I do know this from my own personal life experiences, being very old. That if one was actually was not apprehended for the worst folly committed while young, they were lucky. If that was the worst thing he did, how many did worse than that.?
Worth thinking about what oneself actually did and escaped justice.