Sony Pictures executives might have done some soul-searching about what’s in good taste and what isn’t before they decided to film “The Interview” in the first place. But now a horrendous precedent has been set with the film’s withdrawal from its planned holiday-season opening. It will apparently be shelved for good. Charlie Chaplin to the contrary, scurrilous satire about a head of state in these digital times isn’t a good idea, whether his fans include a squad of hackers or not.