If you read what the CFLPA's issue is, it is all about precedent. Yes, this hit is horrible, and has no place in the game, Lawrence should be punished. The CFLPA is appealing to not only protect one of its own members but the consequences a decision like this could have on future discipline when it isn't so clear. The end of this is a head shot = 2 games.
The issue here is the unilateral power of the commissioner.
Punishment and suspensions should be decided by a panel of representatives of the league and CFLPA. You may still get players appealing, but you at least don't have to worry about the power of one individual.