I think people are making it out to be worse than it actually was. Vicious hit, but there didn't seem to be a dirty malicious intent behind it. The Czech player was in the worst possible position and Abdelkader was already committed to the hit. A split second reaction on a hit like that is tough. If the player had braced himself a bit more, I don't think you'd see him pop up in the air like that. In hockey, it's natural to follow through upwards on a hit, so once contact is made, the energy of the player giving the hit is naturally going to escape in an upwards motion. To make matters worse, the player that got hit had a weak center of gravity on his right foot because he was following through with a shot, which made the hit more vicious and caused Abdelkader to essentially bounce right off him without taking much of the impact from the hit.
It's kind of like a car going 80 hitting a car going 20... their energy has to go somewhere.