I think Hansen was careless but not reckless and shouldn't be suspended. That being said how is Hossa careless in all of this? Hossa was reaching for a puck and was (unintentional IMO) hit by a player that was behind him. If Hossa was careless by not looking behind them while reaching for a puck then every player reaching for a puck would be too.
the way i am trying to analyze it is what are they trying to accomplish? I think if they believe hansen intended to make contact with him (not saying intended to target the head but intended to give him a push or whatever to disrupt hossa from making an effective play) it has to be considered like recklessly having your arms up when delivering a hit. This has to be consistent if they want to eliminate the grey area. If we ever want to significantly reduce headshots allowing the offender the ability to prove a reasonable doubt has to be gone just like it is with the high sticking rule.
Im a huge Hansen fan but looking unbiasedly i think of these points
-Hansen never gives up on a puck. He's not dirty but if he loses a puck he is going to do something to try and make the guy that has it screw up
-the puck is coming down three feet in front of him, throw something three feet in front of you and see how bent your arm is trying to get it
-pretty much any player in the league would have tried to get a hand on hossa in this situation as he is going to get the puck and not you
this leads me to believe the contact was intentional but head shot was not targeted/intentional. Now do we want accidental head shots if contact was intentional? or do we want players to be responsibly keeping their arms down when making contact?