Random aside.
I was struck by the obvious conclusion at the game... the hit on MM was unquestionably legal, and drew no flag, and will result in no fine, but he's out for the season, perhaps a year, perhaps forever. Conversely the hit on VD drew a flag, presumably because he was considered "defenseless" because he wasn't hit in the head, and he got a concussion and was out for the rest of the game, but apparently will be fine and may even play this week.
The messed up thing is that by flagging and fining for the VD hit, they are ENCOURAGING players to go low, and I think that's potentially more dangerous than the chest area hits. If a player has his feet planted, and he's hit hard in the legs, bad things happen, even if the head isn't snapping back.
I dunno, I just don't get this aspect of the current policy.