I don’t believe they lost control.
there has been some homophobia on this thread - people wondering about why a male couple were able to adopt at all for instance.
but I think most people are trying to understand what the hell is going on that something so unbelievably cruel could happen.
unfortunately I know a bit about paedophilia in a professional capacity. Firstly it is another layer after sexual orientation- so some favour boys and othered girls. Some will look for post pubescent children, others pre. Babies are another thing again.
in general, the younger the child, the harder to treat and stop the behaviour.
I don’t know if they had paedophilic material. I am not sure that they are paedophiles. There is a significant amount of people who sexually assault children who are more attracted by sadistic opportunities than sexual interest.
none of this is an excuse. I have spent much of my working life trying to protect children and dealing with the aftermath of them not being protected as they should have been.
the first time I heard about babies being raped was in the rape camps of Serbia. I would not be surprised if the constantly evolving boundaries pushed by increasingly violent porn is a factor in that development.