Saw this posted elsewhere.. makes sense to me:
In this case, brain damage to the wrong part of his brain, most likely.
Absolutely everyone is capable of rape , murder, etc with brain damage in the right spot, and if you think you never could then you're simply wrong. This is just how our brains brains work, see [Charles Whitman](
https://en.wikipedia.org/wiki/Charles_Whitman)'s letters. It's easy to say "Oh he was just evil and those letters were lies," just like it's easy to say "Winslow is just evil," but that's taking the easy way out.
Now, obviously it could be the case that his brain wasn't damaged by football. It could have been damaged by something else, or it could be the result of a mental trauma rather than a physical one. Either way it's a tragedy that could happen to any of us. Or maybe his brain was just congenitally wrong, in which case it's a tragedy he was ever born.