Snatching defeat from the jaws of victory is one of the most agonizing gut-punches a sports fan can experience. Already tortured Philadelphia sports fans got to experience that brutal feeling (again) on Monday — and many are pinning the blame on Philadelphia Eagles head coach Nick Sirianni. Monday night, the Eagles lost to the visiting Atlanta Falcons 22-21 in one of the more egregious coaching malpractices of recent memory. To set the stage, here’s a tidbit for you: ESPN’s win probability predictors gave the Eagles a 97.6 percent chance. The Falcons were able to take advantage of that 2.4 pe…