I'm ok with everything here, except why wasn't his bosses charged? 74 Alarms triggered and no one said anything or did anything. I'm more inclined to believed

I'm ok with everything here, except why wasn't his bosses charged? 74 Alarms triggered and no one said anything or did anything. I'm more inclined to believed that they were happy when he made money but also would not be taking the blame if it went sour, which it did. They effectively looked the other way that is my only conclusion. Yea, I know someone is going to say don't attribute to malice what can be explain with incompetence, but it is hard for me to believe that they didn't know and just looked the other way. In my opinion, his bosses should be culpable.