You are assuming that the obligation to the law wouldn't be reasonably averted if Nefario had consulted with the shareholders. How do you know this? Isn't it possible that Nefario did know what the shareholders would recommend as a solution and therefore avoided a confrontation? We don't know because the obligation wasn't met.
GLBSE itself was a criminal organization. This is like arguing that a mafia don has an obligation to talk it over with his consigliare and his Lieutenants before going to the police to turn them in. Nobody cares that you all signed a blood oath together, those private rules are entirely irrelevant.
I thought you were saying that he's being forced against his will, so he's unable to uphold the contract.
Now, you are saying the contract is invalid because it was against the law.
These two arguments are unrelated in pretty much every aspect. Totally different things.
Let me get this clear... GLBSE did not commit any crimes with regards to my personal ethics. Therefore, from my perspective, your second argument is irrelevant. There is nothing to argue about here. By stating your claim that way, you converted Aahz's slavery example from sarcasm to a very valid analogy.
You need to prove the first point, that Nefario was being forced against his will and hence couldn't fulfill his contractual obligations.