Cuz U.S. citizens can’t bring their handguns to Canada.
It would take more than a handgun to stop (notice, I said "stop") a polar bear attack. Guides in Kodiak country often carry the Marlin 444 lever, or a lever action in 45-70.
Besides, at 1:30 in the AM, being dragged out of one's tent in a dead sleep, I don't think the meal is going to have any chance to grab any gun.
Non-restricted firearms:
Most ordinary hunting rifles and shotguns. These may be brought temporarily into Canada for sporting or hunting use during hunting season, for use in competition, for in-transit movement through Canada, or for personal protection against wildlife in remote areas of Canada. Anyone wishing to bring hunting rifles into Canada must be at least 18 years old, and the firearm must be properly stored for transport.
http://canada.usembassy.gov/traveling_to_canada/bringing-weapons-into-canada.html