I jumped from Reno's post and didn't read any further because it is, I think, entirely fair to examine the often glib claim of recurring and cyclical abuse. Because the corollary of the abuser having been abused must follow that those who have been abused (I have) must grow up to become abusers themselves (I fucking know I haven't).
So, apols if I am being crass or insensitive...but the often repeated claim of repetition down generations is almost as punishing as the dreadful adjustments which have to be made to simply negotiate a life.
Likely backing away now.
No, you raise an important point,
campanula. It can be easy for some people to unthinkingly reverse cause and effect and assume that, if most abusers were abused, then most abused people become abusers, and it is a point which cannot be challenged often enough.
One of the biggest problems is that people often want to "other" sexual abusers and the like - to distance them as far from their own experience as possible. Which means that the whole notion of exploring what the causative factors in people becoming such abusers becomes fraught, because many people don't even want to go there, far less get into some nuanced discussion about how someone whom they would prefer to see as a monster can also have been a victim, too. Effectively, to the simplistic mindset, it becomes an all-or-nothing deal - either you're touched by abuse and thus potentially a monster, or "it never happened to me, guv", and you've never been a victim, and of course you're not a perpetrator.
Real life, as we know, is a bit more complicated. Which is not - and I always end up saying this, but perhaps it isn't necessary - to excuse in any way the behaviour of the perpetrators. Explaining, and exploring the causes of, people becoming abusers is not the same thing as excusing them for being so.