I remember Haynesworth landing on Schaub and taking him out a couple of years ago. Schaub should have gotten rid of the ball. Some of this stuff is on the QB, as well. They often put themselves in these situations.
You can research the board, but don't get your posters mixed up. I've never complained (or whined) about a hit on Schaub. It's football.
And you're probably right, though, that some might take exception. But this is our guy laying the wood on their guy, so finally that hit goes our way.
As far as your elbow comment, I won't disagree. I've seen Ray Lewis use that exact same technique for 15 years, and the NFL uses his play as an example of how to play the game. Cushing is just taking notes from the best.