If the NFL ruling on Brady was arbitrary, so was the judges.
How is deflating balls conduct not detrimental to the league, nor is covering up an investigation, and PEDs alone is?
If Sherman argues that the second half was better than the first for the Patriots, showing it didn't affect the game, that is like saying a strongly superior team can never be accused of cheating...
What did Hardy do that was detrimental to the league? He got caught up in an argument with his ex-girlfriend that went public of which nobody even can verify what happened..
You may as well ask, "What did Big Ben do that was detrimental to the league?"
Is there really any need to ask that question? How the NFL chooses to define what is detrimental always has been and always will be up to the discretion of the NFL. Just like any other employer in the country, they decide what conduct makes them look bad. Arguing whether or not you think it was detrimental is pointless because neither you or I - nor anyone else on this site - has any say in the matter because we aren't owners in the NFL.
Now, whether or not his suspension is just is certainly up for debate, but even this ultimately doesn't matter because it looks like he'll serve every bit of that 4 game suspension without a fight.
I suspect the real reason he isn't going to contest it is because the NFL holds the ultimate trump card. As far as I can tell, he's still on the exempt list. Searched around a bit and no mention of him ever coming off the list. Asked in this thread and nobody replied so I'm assuming that nobody really knows. If he is on the list, overturning his suspension is irrelevant because he still cannot play while he's on that list. Roger controls when he comes off the exempt list and the exempt list has been an included part of the CBA for some time (Vick went on it in 2009) so there is no "technicality" to have the courts intervene. He could have his suspension entirely squashed and still be subject to Roger's call. As it is, he's probably hoping that his 4 game suspension will satisfy Roger's need for punishment, but if he were to go through with the appeal and have his suspension reduced to nothing who knows how long Roger keeps him on that list. Based on when Peterson came off the list, it could be the full 10 games.