Not attacking anyone's opinions, but I kinda think that "park" bears, that have frequent contact with people, are probably more dangerous than a bear that's never seen a person before. Even though we may think of the "park" bear as tame it is probably the more dangerous of the two.
Animals don't like people. Given the chance, most wild animals will leave the area if they spot a human. (Excepting of course a starved animal, a sick animal, mother with cubs, some animals in a certain area during rut, etc.)
People at Yellowstone and other parks are warned by the staff about feeding bears, storing food securely, what to do with trash, where not to go, etc. These warnings are being given because the staff realizes that the bears have figured out that people are defenseless and usually have food with them.
It is the animal that is no longer afraid of people that is most dangerous to us.
That is, afraid in a cautious/suspicious nature.
A panicked animal is afraid in a whole different way, and is extremely dangerous.
I would be more likely to take along some bear medicine when visiting Yellowstone, Yosemite and others, than if I was going to a very remote unexplored area of the country.
That doesn't mean I would go anywhere in the woods unarmed. I don't.
I'm just trying to make the point that it's more likely to have negative contact with wildlife in a park area than way off in the sticks.
$.02, -Kframe