No, managers look stupid when they do stupid things.
When players are out in the right spot they will still often fail. Vaughn probably doesn’t hit a 3 run home run in the 8th. Foster or Bummer might well have been hit in the 7th. When you put guys into a position where they have their best shot to succeed and they don’t, people don’t blame the manager.
People blame the manager when he says things about wanting a single with the tying run at home plate or when he doesn’t recognize that his starter gave everything he had, or even ask, and puts guys into positions to fail.