Cooper's hawks are common here and especially abundant in what we call 'the montane zone' between the foothills and the actual alpine areas. I've never heard of anyone being attacked. Having said that, however, I've lived in different regions of Canada and birds of prey seem to be quite variable in their behaviors...not unlike mammalian predators like wolves, cougers and so on. Perhaps different behaviors are learned and adapted to diverse situations. I'm not sure why a bird of prey would bother about large mammals (like humans) unless aggression was taught by the parents. A lot of birds in the unpopulated areas of Canada will take no notice of humans. A crossbill or boreal owl will land on your head as if it was a branch whereas, in populated areas, they wouldn't do it.