Until the status quo changes, that's just the way things play out. You saw it before the trade in the reaction to Russell's story about Manning; headlines like "Manning saves Redskins from themselves."
Nationally, the logic is: It's the Redskins; therefore, it's a bad move. Dan Snyder's the owner; therefore, it's a a bad move. The team's actions will never be analyzed on the merits of the action, but on the reputation of the franchise. That reputation may be deserved, but this move isn't $100 million for Albert Haynesworth. This isn't Donovan McNabb.
We have to see how things play out. If Griffin is as advertised, by 2015 nobody will care what they gave up.