I can imagine scenarios where decent people in tough environments might be compelled to join a gang, rob, or even murder. That doesn’t make it ok, but it makes it at least understandable.
I’m unable to imagine a reason why decent people might be compelled to rape children, let alone serially.
> decent people in tough environments ... murder
You find an excuse for MURDER? You are definitely not a decent person.
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Well, if it gets normalised during childhood, then it frequently occurs during teen years and adulthood.
You can see some discussion of that in the Australian Royal Commission into Institutional Responses to Child Sexual Abuse (2017)
* https://www.childabuseroyalcommission.gov.au/final-report
There is the position, of course, that a sexually abused child that reaches teen years or adulthood is no longer a "decent person" .. which is an interesting transition to dwell on.