This is the new NFL under Rodger Goodell where things like players taking matters into their own hands are not acceptable. No player is now willing to risk fines or suspensions for going after Brady's knees even though the Pats are running up the score on teams that cannot stop them. Belichick is banking on the fact that teams are now restricted by some new tough stance on players taking things into their own hands when the opposing team tries to humiliate them.
If Brady and the Pats did something like running up the score and humiliating their opponents 10-15 years ago in the NFL, someone would have taken Brady or any number of their key players out by now.
Belichick is playing mind games with his opponents, the NFL, and the media. Opposing teams and the players talk tough in the media; however, no team (or player) is tough enough to take a stance on the field right now against what the Pats are doing. Until a team decides enough is enough, Belichick will continue to run rampant through the NFL and spit on every team in his way. And Belichick has every right to do so because the other teams on that playing field can't or won't do anything about it.
Let's hope the Colts have something to say about what is going on when they play New England this week, and if (or when) Brady gets his knees cut, New England fans better not be crying that it was unfair because Belichick's approach has set up a key injury to one of his players. If you can dish it out, you better be ready to take it as well.