PHOENIX — A commissioner who acts like he wants his profile on a stamp and a rule book that must be read by cryptographers to be understood are just a couple of the NFL’s problems on display this season. But neither of them comes close to the problem the NFL is going to have when the public fully awakens to its Big Tobacco-style corporate callousness, an indifference so cold and snowblind that this week a league exec urged parents to potentially compromise the brains of their 10-year-olds.