Every last human is capable of the evils any given human comitted

If you strip away everything that has made them an individual, yes you're right. But I think that just highlights that your argument is a pointless distinction.

If you swapped me out at birth with a Nazi general, there's a good chance I'd be driven down the same life path.

Likewise this means you have to accept that there are many people, due to their upbringing and the principles they've adopted in life, that wouldn't destroy a corner shop for no reason. That wouldn't assault a woman trying to protect her place of work.

even if you don't personally act on it.

But that's exactly why this makes all the difference. The capacity for action is meaningless, as you state, we all possess it.