There is de facto responsibility (DFR) associated with any intentional action.

An act performed under misinformation isn't intentional.

The mob boss situation is different

Only because the mob boss's intent is made explicit in the example. The same boss who owns a car dealership, and all his gang members just happen to get cheap cars there that they use to commit crimes, we're back to your example.

Each party is DFR for their contribution to the tragedy of the commons

That doesn't mean anything. There's no logical consequence that flows from it.