This is just such a sad situation. I wish they had been able to find out more when they investigated, but I guess they can't always get it right. I really feel for the father. He did what he could to stop his son and he wasn't able to. It reminds me of a certain person I know whose family member was involved in a different kind of violent extremism. Sometimes people you love go on terrible paths and you don't have enough information to do anything until it's too late.