As an avowed non-Patriot fan and long time ( lifetime actually) Jets and Giants fan, I doubt that a 2.0 psi decrease in a football made any significant difference in the outcome of the playoff game with the Indianapolis Colts when they were discovered. The fact the Patriot footballs were a bit soft made no difference in my opinion in the final score. I also assume that the footballs were properly inflated for the Super Bowl and the Patriots still won the game. (Truth be told though, the Seahawks did a great job snatching defeat from the jaws of victory. )
Why then does the NFL have very specific limits on the inflation of their footballs? A softer ball is an advantage in certain conditions. Better grip, better spiral, better throws.
Who's to say though that on some very cold or wet Sunday, a slightly deflated football allowed a certain quarterback to make a throw that he may not have made with a properly inflated ball while the opponents QB had to use the harder to grip pigskin.
The integrity of the game is what is at stake and leads many to start thinking about what else are they up to that they haven't yet been caught at? No doubt the won loss record speaks for itself and the team is one of the greatest football dynasties ever. ....but they do use every means they can to find an edge and some of those means are a tad sketchy. It does taint the successes somewhat.
The other bothersome issue is the failure of Brady to turn over his cell phone ( which presumably would have proven his innocence) or even allow having his lawyer to look at his cell phone and report to the NFL what was on it for the time in question. For the privilege of playing in the NFL a player has the responsibility to follow the rules and cooperate with this investigation. Brady did not.
You can support Brady and the Pat's all you want, but if they had the opportunity to prove that they did not break the rules, then why not just do it?