It's not genetic, it's a sociological cycle of abuse of children that's been going on there forever. You can see it portrayed in art, from Dickens Novels to Pink Floyd's "Another Brick In the Wall" to "Absolutely Fabulous" on and on.

Kids in England aren't regarded very highly and are spoken down to, traumatized, marginalized and damaged, and what happens is that they only have each other for comfort and nurture.

As they grow, they associate comfort and nurture with childhood and seek it from Children.

So, they grow up to abuse their own and buggar the other ones, on and on, forever and ever, and if everyone is doing it who's going to do anything about it?

It's just an Island, after all.