It was a freak accident; the act was unintentional, the outcome was unintentional. However, Petey was targeted and put in this situation because he's Petey. 

If that was Tim Schaller, I don't think Kotkaniemi would have bothered getting tangled with him. Petey will always be targeted and played harder against because he's an elite player. It's the Canuck's player's responsibility to deter opposing players from playing Petey hard. The less hard they play Petey, the more success Petey will have, and therefore the team. 

I don't agree with retribution, but I agree with creating deterrence, and the Canucks by showing no response, have not dissuaded opposing players to continue to target Petey.