Why not jail the parents?
They are the ones who ultimately made the decision.
If you follow bad advice and don't look into the qualifications of those giving it, that's on you.
I know everyone wants to blame the GB for everything but ultimately I think we need to place blame where it lies. If you put blind faith in someone or some belief system and chose to follow it to the point that your child dies, and you didn't bother to put effort into researching things ... that's all on you.
In the same way that parents today can believe in homeopathy and watch while their child dies. Yes, the advice is nuts, but the parents are the ones who follow it.