Do you genuinely believe there are people out there who aren't born predisposed to violence? This is a well known fact and a reason we have prisons for people who are not able to be rehabilitated. There aren't nearly as many monsters out there as people think, but they're there.
People like serial killers are well known for having relatively normal upbringings but go on to become murderers/rapists. Some even come from loving, caring, and enthusiastic homes.
People can hand-wave genetic predisposition all they want, it doesn't make genetic heritability for a multitude of of disorders untrue. Nor does it change how you rolled poorly in the genetic lottery and now you're stuck with a male brain inside a female body.
No amount of therapy is going to keep some poor pedophile's brain wired to find children attractive from finding that they're attractive. They get to live their entire cursed existence hating themselves even if they never hurt a single kid.
People give biology way too little credit for the monsters that society has to deal with. And as shown above, a lot of it isn't due to culture, how you were raised, or if you were loved. It's because you hit the genetic snake eyes and you don't have the little thing in the back of your brain that finds rape and murder repulsive.
Genetics doesn't absolve them of their guilt, but it's one piece of a puzzle that too few people give credit for. For the same reason why one kid can do coke once and never try it again, and another ends up having their life spiral out of control for a decade due to addiction.
I like how you don't mention what kind of supremacist lol. Human supremacy ftw!