The bartender knew the mob well enough to know that if he cooperated with the police in any manner he was a dead man. He was smart. He didn't object to a mob killing - he objected to a mob killing in HIS PLACE.
He would not have helped the police in any manner. His answer would have been, "I was in the back washing some glasses" or somethinhg like that.
I tend to agree. If it was today, maybe not. But in 1959, at the height of the Mob's power and "mystique," no way he'd rat. Don't forget, this is before the Witness Protecion Program was formed. Where was he gonna go?
