I'm quite confident that the error was:
"Despite potential warning signs, we believe Sam to be an ethical person"
and not
"We know that Sam is an unethical person, but that's either not a problem, or an actual asset when it comes to running our venture fund"
The former is definitely still an error, but it's quite different from the accusation being leveled on this thread.
I agree. I don't think there's much public information out there about the due diligence involved in his hiring.