So two brothers committing the same types of crimes?
While there does seem to be a correlation between being abused and then later abusing, I should think that a Catholic at least would be LESS inclined to subject someone else to the same evils and sufferings that he himself experienced. While the tendency might be created in the abused->abuser, it still requires an act of free will to commit the crime against someone else.
I've never completely understood how people could live these kinds of double lives.