Sorry this may be a ramble, it's a stream of thought. Apologies
The other argument to that would be, and I'm not saying this was the case with what happened in your life, but there will be abusers who abuse young children who are abused themselves, that would have, without the abuse committed on them, have eventually with no input from anyone else gone on to abuse a child.
I do think there will be a percentage of children that are so badly abused that they are unaware their behaviour is so far from the norms of society that they don't realise that abusing children is wrong, until later into adulthood. At which point, the past abuse becomes irrelevant as then they become responsible completely for their actions from that point on.
It was a perfectly normal part of their entire childhood, that probably increased in depravity of what was done to them over time and so their sexual responses are continually reinforced through their own childhood that sexual pleasure and children with adults is what sex is all about. they than repeat the abusive cycle.
But that's the brain evolving in the same way that porn addiction worsens, as stated by the man in the clip, as their sense of decency and their sexual responses gets blunted and less enjoyable they move onto the next thrill. Increasingly getting exposed to sure and wise rumours our porn. The journey is through bestiality then into children being abused. Then all combine the two. These guys will start taking more risks until they get arrested, or if not, decide porn isn't enough they need an actual child.