If you read further in the linked column, Chuck calls Goodell a "pure politician." I think that's the answer you're looking for: Whether or not it's actually true, he can tell himself that the punishment levied against Belichick and the Pats* was severe enough to stop them from doing it again, and that's a compromise he can live with. Plus, $500K is a sizable chunk of change even for someone in Belichick's tax bracket.
(As for me, I agree that he should have gotten some time off along with the fine, and destroying the original batch of tapes was a misstep -- one they corrected by playing the Walsh tapes in their entirety for the media.)
Is Goodell's "do the right thing" image just that, a fabrication by a P.R. genius? Looking solely at Spygate might lead one to wonder ... but I'm not sure I'd agree. In this case, "doing the right thing" meant resolving the situation with the least amount of damage to the league he so loves, and the recent radio silence from Snarlin' Arlen Specter is a sign that his plan is working. Sure, we'll still have our fun with it, as will fans of every opponent on the Pats* schedule for the next ten years, but the uproar has died down.
When I sat down to write the original piece Friday evening, I knew I didn't want to focus on the specific Bills topics (Toronto/Lynch) which had already been covered in depth by the media outlets present at the press conference. Reading through my pages of notes, the constant references to "rules" and "consequences" caught my eye.
That doesn't mean I believed everything he said.