Solve the mystery #9

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Detective Hobbs found the notorious gangster Scarface Joe found lying face down on the bar room floor. A bullet had entered his left ear and must have lodged somewhere in his brain as there was no exit wound. The bullet matched the gun that was owned by Bernie the Bull, another hoodlum, and Joe's rival gang member. It was well known that they hated each other but frequented the same bar. Bernie said that he was the only customer in the bar when Joe came in and started yelling at him. "He was like a madman," said Bernie. "He pulled out a knife and started coming at me. I shot him in self-defense as he charged head-on at me swinging that knife." Joe's body lying close by still had the knife clutched in his left hand. "He just wouldn't stop coming at me," exclaimed Bernie. "I had to shoot, I had no choice." The only witness was the bartender, another shady character, who agreed with Bernie's story. Detective Hobbs just smiled and said, "you boys will have time to think of something better than that story on the way to the slammer." Why didn't he believe them?