Because it was a rule brought about by Brady and the Patriots. And now we see why.
Yep, and when they get caught with their hand in the cookie jar, all they do is deny and deflect. If the advantage of 1-1.5 PSI below the rule is such a non-issue, why are they sneaking the game balls into the bathroom to remove some air? Maybe they could have argued that the deflator was bulimic and broken down how 100 seconds was long enough for him to run into the bathroom and gag himself.
Scrap the rule about each team getting their own set of footballs, have the refs control the balls used for the game - like every sport known to man - and tell the Pats to pound sand in the appeal. They got busted, they're entitled to the appeal, but the severity of the punishment is because this is the second time they got caught cheating, and they have not cooperated with the league on this.
Another point of note: the Patriots claim that they did nothing wrong, yet the 2 guys involved in this weight loss scheme were both suspended indefinitely. These guys are Patriots employees, not employees of the NFL. If nothing happened, why wouldn't these guys be reinstated?