He played psychopaths, gangsters, corrupt cops and guys you don’t want to mess with. A lot of times in those roles, he was so convincing that you thought in real life, Ray Liotta must actually be crazy. But that wasn’t all he played. Liotta also played good guys, heroes, sensitive fathers, surgeons, athletes and lawyers. In “Operation Dumbo Drop,” he was an Army captain who helps deliver an elephant to a village in Vietnam. He even did a pair of movies with the Muppets, and he didn’t pistol whip any of them (at least not on camera). Liotta, who died this week at age 67, didn’t mount a career m…