This whole thread makes me think we are much stupider than wild animals, and certanly the most arrogant of all the animals.
There is a book by Daniel Quinn called Ishmael that claims that humans feel as though we own the world, and that this belief is what makes us okay with destroying natural things to make our lifestyle more "livable" even though we are killing the very things that allow us to thrive. I won't tell you what he blames for us thinking the world belongs to us as that will cause another 30 page discussion over nothing but anyone can certainly go buy the book.
Think of it like this: Imagine that you have gone to a city you are unfamiliar with and have found yourself broken down in the worst of neighborhoods. Do you reach for a gun to "protect" yourself from the chance that the natives will attack you or do you show them respect and know you are a visitor in their domain and will be out of their hair as quickly as possible? If you chose reach for a gun, you would most likely be dead in a few minutes. They would take this as you being disrespectful, stupid by showing your hand, and take advantage of the fact you are alone and scared. As long as you show them respect and that you understand you are not in control of their domain (and that they are) you will be left alone or even accepted in most cases. Even if you are robbed, you walk away with your life intact.
Why is going to a national park any different? Why do we feel the need to set up a tent and protect our ground from the native bears? If you are dumb enough to leave food out where they can smell it and take advantage of it, then at least have the courtesy to walk away and let them do what they do. Yes, you may have to buy more food. That is the price you pay for being in their domain and not protecting what you have better… but by walking away, you still have your life. Will a bear come kill you why you sleep? We all know that you have a better chance of being struck by lightning twice before this will happen.
I can arm myself to the T for every situation, or I can think smart. I choose smart. All of us animals, regardless of species, take advantage of weakness for personal gain. This is true in humans as much (if not more) than wild animals… just look at business practices and why certain companies thrive better than others. That is all bears are doing when they walk into your camp site – bettering their chances of survival by getting an easy meal. We are in their home, why not respect that and let them be the king in their domain, just like we would in an unfamiliar neighborhood.