Hey Perhaps its 'Melter' who is secretly making some if not all of the Thin-Man's experiments go wrong? Perhaps Suspera, was something Melter did totally on his own?
Even so, Melter takes orders directly from Thin Man (or at least the organization that Thin Man founded) and the leader of any organization is directly responsible for the conduct of his people. The fact that Thin Man, by his own admission, does not care is no excuse or legal pardon.
Some folks were trying to defend Halcyon, saying he didn't "deserve to die" for his complicity, by neglect, in Suspira's case. Unfortunately, when you agree to become a rubber stamp, whatever the reason, it no longer matters if you "deserve" death or not because that's the price you ultimately pay once you make that decision. (If those who are abusing your "figurehead" status don't kill you themselves, they merely use you as the scapegoat and let the authorities/victims do the killing because it's YOUR signature on the orders after all.)
The Thin Man is ultimately in a far worse position. He is fully complicit in their activities, not only by hiding their involvement with memory manipulation, but also by knowing about their behavior yet taking no corrective action simply because he does not care.
He finally convinced Maytag to eat that sandwich by saying "we could have easily done something in your sleep." Frankly, we can't be certain that he HASN'T. I mean there are two-part chemicals in this world. Heck, we can't even be sure Maytag was actually asleep for three days.
Frankly, in Maytag's place, I would have demanded that I be released IMMEDIATELY, and that my possession, ALL of them (including the ones stolen by Danzig's team) be returned to me with the promise that if I had to force my own way out, the result would be very unpleasant for Thin Man and his little sycophant.