It’s probably safe to say that any actor that was acting since a child, but then went through a period of self-destruction, didn’t do that because they were devastated over not working inhumane hours.
Interestingly, the "working inhumane hours" trope was once valid -- but is no longer.
Nowadays, child actors on a commercial set cannot be asked to work longer than something like three hours per day. And not more than 45 minutes at a time (check union rules for precise information). The off-hours are scheduled for play, school, meals, snacks whatever. It's a rigid regime.
However, one of the guys I cast (as a senior citizen) had been a child actor from the thirties...and we became close friends. He recounted his experience as a child actor: yeah, it was long hours -- but it wasn't "inhumane" and it wasn't "abusive"; "We all worked long hours in those days".
And he was never exposed to "perversion".
Hollywood is a lot different today...