According to the 2023 biography Carnage: A Succulent Chinese Meal, Mr. Rent-a-Kill and the Australian Manson Murders, at least. Jack Karlson was a victim of child sexual abuse and really terrible child abuse more generally when he was in the care of Blackheath Presbyterian Boys' Home as a teenager, which I think is an important bit of context for how he ended up becoming a neo-Nazi: he was thoroughly traumatized as a kid, turned to a life of petty crime, and in true Lumpenproletarian fashion became a reactionary. This is how I understand it, at least.

It should go without saying that this doesn't excuse his Nazism, though. There are obviously many victims of CSA who don't grow up to paint Hakenkreuze on their cars and say "two Heil Hitlers" instead of "three cheers".