Sort of. It isn’t lawful to fire them.
West Yellowstone is a town. The area is Buttermilk creek I think, and outside the park boundary. Unless one is hyper vigilant and uses a chest rig, and is a good shot under pressure . . . Grizzlies are quick, as fast as a 1/4 horse. Grizzlies often attack, that’s . . what they do.
What I’ve noticed is the perennial reporting, it tries to split that baby, and imply that it is always the natural order of things for bears to be fearful of humans by sight alone and run away, and only when they become “food habituated” do they lose their fear of humans. I wouldn’t take that bet.
Unarmed humans are soft, easy prey. Predators only became wary of humans when they were being shot on sight. Now that they do not have a REASON to fear humans, they don't.