Simply because something is commonplace it can’t be dirty? I’d guess it’s not that heavily unusual to sneak in an extra blow after a tackle, but that doesn’t magically make it fair play.

But personally I’m more disappointed that nobody on the Seahawks retaliated than I am that Dockett did it in the first place.

If I was an o-lineman, I’d be throwing some dirty cut blocks on Dockett’s knees, or if I was a defender I’d be putting a helmet to Warner’s jaw (even if I had to do it 3 seconds late because nobody could have touched him otherwise). It might sound like a childish response, but just like in baseball, the best way to protect your guys is to show the other team that there are consequences for going after your guys.