Men,
Wolves definitely kill simply to kill. They have decimated the Elk in Bridger and up Greys River and at the same time up to just recently been on the endangered species list which meant simply if you shoot one and get caught you're going to jail. Elk calves and Mule Deer fawns and yearlings as well as Shiras and any livestock they can find unattended are all prime targets. I don't think they would have a problem eating one of us.
Guides that hunt in the area just outside of Yellowstone tell me that they will eat from the front end of a kill back and only eat (in most cases) part of what they kill. If that area were more urban than it is there would be more human contact and we would be reading stories about residents of Jackson Hole or Alpine getting eaten by wolves.
Kill'em where you find em.

Dave