Why stop with the executives? Why not throw the shareholders into jail --- they approve the selection of the executives and benefit from whatever malfeasance you are targeting.
I do think there needs to be legal culpability for anybody who was informed of risks and pushed on regardless. Though I can see where it would be very hard to prove anything.
It really is a tough problem here. I hope that somebody will be seriously punished for the deaths of hundreds, but I’m very doubtful.