Deflategate for Dummies
I know it's obnoxious but it just makes sense when you break it down.
Did deflating the balls change the outcome of the game?
Admittedly, no. In the second half, the deflated balls were replaced and that's when the Patriots started blowing the Colts out.
However, the NFL has to punish a team for breaking the rules. It's not about how effective the cheating was, it's about the integrity of the game. By attempting to gain favor, the Patriots soiled that integrity.
Moving past that, the NFL launched a very thorough and expensive investigation that ultimately didn't result in concrete evidence that Tom Brady was involved in the altering of the footballs.
HOWEVER, According to the CBA that the NFLPA agreed to, Goodell has the final say with any and all suspensions. Playing in the NFL is a privilege, not a right, and Brady does not have to be proven guilty to be suspended.
Does this give the commissioner too much power? Perhaps, but this was part of the agreement that the NFLPA agreed to. Brady and company could appeal again, but ultimately, it's always going to come down to the fact that the NFL, and the commissioner in particular, has the final say as it is his jurisdiction.