The contagion of crime is like that of the plague. Criminals collected together corrupt each other; they are worse than ever when at the termination of their punishment they re-enter society.
I was in prison, and you came unto me. Verily I say unto you, inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me.
~(Jesus Christ) Matthew 25:36, 40
Whatever you think of de Sade, he was a complex figure and we should not look for easy answers with him. He was, strangely perhaps, against the death penalty, and he was never put in prison for murders or anything like that.
Crimes lead one into another; they who are capable of being forgers are capable of being incendiaries.
When is conduct a crime, and when is a crime not a crime? When Somebody Up There -- a monarch, a dictator, a Pope, a legislator -- so decrees.
To be in prison so long, it's difficult to remember exactly what you did to get there.