Seahawks play aggressively. They do not intentionally break anyone’s legs. Record shows they have caused less injuries than most other teams. That is not playing dirty. Any aggressive defense will cause penalties. Seahawks managed get the best win/loss record in entire NFL during 2013 in spite of the penalties.
There are rules in football. The Seahawks have decided to break the rules often and play the odds of not getting called on it.
That’s dirty football and ruins the game.