I'd be more willing to take your line of thinking if you'd have had valid explanations for why others who have done as bad, if not worse, haven't (be it racism, extremely dangerous tackles - which are worse than biting, biting etc).
Suarez is worth keeping, so you take the good with the bad. I just hope the ban is realistic. If it's over 10 games, even you'll have to question what makes biting worse than racism, irresponsible (not intentional - i.e. taylor on eduardo) leg breaking tackles etc ...
I spend my day going in and out of courts where I know there will be major differences in the outcome depending on the client and the judge. You could end up talking yourself into knots to explain why things differ regularly.
I just accept it and control what I can to get the best outcome. In Suarez's case, if he feels the FA are out to get him it is in his power not to end up in front of them. It's a lot like having a ref that clamps down on diving, a smart player wouldn't dive in front of him. Suarez on the other hand would be flopping all over the place and you'd be here trying to justify him being such a stupid cunt