By that logic, Steve Tuttle should have gone to jail for attempted murder.
The two circumstances are not even remotely similar but nice try Mr. "logic". If what Cooke did is sooooo commonplace then where are all the sliced legs? Maybe it's because the vast majority of instances where a player is pinned from behind didn't involve a douchebag like Matt Cooke and therefore didn't result in an "accidental" leg slicing. But I'm sure Karlsson was just "unlucky" in this case, I mean that's what all the talking heads on tv are saying right? And of course we believe everything that's on tv right? Everyone is CERTAIN of Matt Cooke's "intent" right?
I hope someone seriously hurts Matt Cooke. (by "accident" of course )