Suh's hits on QB's have been much worse over the years, and he has been penalized by small fines. Stepping on Rodgers was perhaps the softest of his dirty plays, and he gets suspended for a playoff game. You will have a hard time convincing me that the QB he stepped on didn't have something to do with the stiff penalty.
Once again, this is coming from someone who will be cheering for Romo and the Cowboys, so I'm very happy Suh isn't playing against them.
Penalties by Suh over the years:
2010
Suh rips Delhommes head off - $7,500
Suh uses opponent as leverage on FG - $5,000
Suh forearm punches Cutler to the head - $15,000
2011
Suh body slams Dalton - Fined $20,000
Suh stomps on Evan Dietrich-Smith - Suspended 2 games
2012
Suh kicks Schaub in the man parts - Fined $30,000
2013
Suh low blocks John Sullivan - $100,000
Suh helmet to the chest of Weeden - $31,500
Suh throat slashes - $7,875
2014
1 1/4 years after his last fine/penalty
Steps on the leg of Rodgers - Suspended for a playoff game