I wonder sometimes about animals being afraid of humans due to hunting. But with wolves I can understand it. Wolves are smart. At the University of Washington a study was done with crows. People put on masks that were unique and trapped crows while wearing the masks. While in captivity the crows were fed and so on. People who fed the crows and treated them nice wore one mask and people who trapped and treated them not so nicely wore a different mask. I wouldn't be at all surprised if wolves, coyotes, and bears can disseminate knowledge of threats that span generations. In the case of the Seattle crows they have done so for at least 17 years. Here is a link that explains the study way better than I just did, and there are many more:
Crows hold grudges against individual humans for up to 17 years | Urban@UW
Eric