Not all abused go in to be abusers but there is a correlation. Others harm themselves instead with drugs, alcohol or suicide.
The wonderful psychologist Alice Miller thought the difference between those abused who became harmful to others or themselves, and those who do not, was that the latter may have had the chance to be heard by an empathetic witness.
None of this means these men are not guilty of rape or that their pasts should be mitigation for their crime.
It is worth looking at the evidence though at what massive harm is caused to the psyche of children when they suffer abuse.