Bullshit. You are perfectly capable of letting your children be punished for their negligence or stupidity, and any action to lessen that punishment will just show them how far you are willing to sacrifice your own life to keep them from learning a hard lesson.
They know he knowingly defrauded millions of people out of billions of dollars. If I did that, my mom would let me go to prison for the rest of my life because she knows she taught me morals and that human beings are more important than money and if I decide to ignore that moral framework as an adult then that's on me. Dude is an adult with a fully formed brain. Stopping a twelve year old from burning themselves on a hot stove is one thing, but if your fully adult son still needs to told not to touch the hot stove, it's time to let them fuck around and find out themselves.
That all assumes they had no idea what was going on, which I don't know is believable.