I have been stewing over this in the shower, I, along with others on here, worked in Child protection and delt daily with this sort of thing, people like him WILL go on to father loads of children and demand all sorts of rights to visit them etc, he may well not have further children removed from his care, I have met loads of unfit parents that still had child care responsibilities, one thing I always thought was they should never be allowed to breed, my goodness, all the health checks for dogs yet know one seems to bother about human parenting checks unless something drastic is flagged up.
I found people men and women, who had abused thier children would complaine all the time about how poorly they were treated and how they wanted to see thier children much more, the courts prefer children to stay in contact as much as possible but sometimes its not good, I so remember a very very dangerouse man, he was a big good looking man that did some truely horrid things, yet, he came to visit his children, supervised and all used to be OK, in fact, I got on very well with him and his children but I knew his limits, but the bit that made me laugh, he was also a perfectionist and his children were only young, they had painted him some pictures while waiting for him and I joined in, the bit that made me smile, when he left he just took my painting, he had no idea it was mine and the children just kept quite, no one would dare challenge that man, so glad I moved away.
So, the answer is castration, they at least will not father any more children, still do things to others though