Plausible? Sure. Stupid? Probably. After the hell Prince Harry raised by slapping on a Swastika armband for a 2005 costume party, it stands to reason that most people in the public eye would avoid Nazi-like arm gestures and fashion statements at all costs (excepting John Cleese, whose Hitler parody deserves some kind of trophy.)
Put together, the three incidents serve as a reminder that (to paraphrase "30 Rock's" Tracy Morgan) when it comes to making off-the-cuff statements about Hitler and the Holocaust, whether with words or body movements, it is indeed too soon. Gibson, with his affinity for anti-Semitic comments, is a goner.
"I'm not sure what the cause of this could be except a sudden bout of celebrity mental illness," mused Hollywood publicist Michael Levine. "Oliver Stone, he's a great filmmaker, a brilliant filmmaker, but that shouldn't give him a free pass to say morally contemptible things. I don't think Mel Gibson has a future in this industry. Paris, who knows?"