What I'm suggesting is that "growing up a criminal" has twisted your morals a little.
If you can excuse your own offending behaviour, if you can condone your friends offending behaviour by means of your childhood etc. then why do you find it so difficult to at least accept that a sexully abused child can become an abusive adult?
Which do you regard more highly an armed bank robber or the mugger of O.A.P?
I view them both with equal contempt, THEY'RE BOTH SCUM, it's just as terrifying for a bank teller to have a gun thrust into their face as it is for a pensioner to be robbed, they're equally as defenceless.
Or is it justifiable by the amount of money that is stolen?
Yo abused nonces in prison, great, but remember the pleasure you derived from abusing him is the exact same pleasure he derived from his offending behaviour, you just choose to justify your actions for different reasons.
You're just as abusive as the people you condemn.