There's really no sense arguing the call, particularly as no fans are going to change their mind on it. Fans (all fans, not just Caps and Canes fans) are inherently biased. Try as we might, it's virtually impossible for us (at least most of us) to look completely objectively at a play because we have a vested interest in the play going our way. We have invested way too much in the teams we follow to allow us to be truly unbiased. If the call is overturned, a lot of Canes fans would be pissed. The call stands, a lot of Caps fans are pissed. Same goes for marginal hits. Fans of the "hitter" almost always side with their player (unless it's really blatant) and fans of the "hittee" almost always side with their player. It's natural.
I think rules are written clearly for the most part, but interpretation of rules requires a human factor (was a guy pushed and it was unavoidable, did the puck get knocked in before contact, did the contact prevent the goalie from playing it, etc)....and since no two plays are exactly alike, no two interpretations are going to be exactly alike. It's part of the game, and frankly, I think professional sports leagues actually like the controversy, because it's press and because it gets more people talking about it long after the game is over.