A common response seems to be how dare the NFL enforce such a rule when they have been knuckleheads about other rules? That doesn't actually address the infraction and it's not actually an argument against the rule being wrongheaded or the punishment being unfair. It's a juxtaposition that is meant to incite outrage against this capricious and arbitrary enforcing body. The NFL can of course be capricious, arbitrary, or plain incompetent but this juxtaposition is just a distraction tactic. A deflection.
The legal system is rife with examples of boneheaded rules on the books and judgments that vary. Nobody walks into court and uses that as a defense or pretends it is relevant though, unless they want a gavel up their bum and a pissed off judge giving them the maximum.
Our love for Lynch far outweighs any negative these behaviors generate, and that is right and good with how hard he plays and how good is with everything else. But he's not taking some heroic stand here. I would argue if the league did not punish Marshawn or threaten to punish him for such an easily-detectable infraction, they would be guilty of further inconsistency. Not to mention you cease to function effectively as a governing body if you don't enforce the easy ones.
Having said all that, I am a fan, and if Lynch scores a back-breaking TD in a situation where a 15 yarder won't kill us, I'll have a hard time generating much ire. If he does something that ices the game, he can run around naked on the field and dry-hump the sideline reporters for all I care.