There is no ‘cure’, it is inherent in their being...............
Well, he's 11. We had a bad seed in our family, the first 30 years or so of his life he was a complete monster, and other than a few hard knocks he never was punished. Or treated. He never did drugs, or drink, he was just mean. Nobody even knows why he changed, but sometime in his 30's he stopped being bad. The next 30 years (to this day), he's been living a blameless life except that he is plagued by regret and the conviction that the things he did have put him beyond redemption. It's sad. My dad talks to him about it and he says things like "Jesus didn't die for THAT." He'll cry and insist there's no fixing anything he messed up, and he messed up a lot of lives. His kids were born when he was past 40, they adore him. In my lifetime I've never heard him speak ill of anyone or raise his voice. So...it does happen, and no one should give up on a little boy. There's a reason in heaven that his dad survived this.