Bears aren't "mean" like people can be sometimes, they're just wild and very unpredictable. Like all wild animals, they need their space. As long as we respect that space they are beautiful creatures. When we don't, that's when they get mean.
I agree with rob they are creatures that only really attack a human if they're really desperate for food or if your near there cubs. Just remember that there more scared of us than we are of them. And the animals could easily be tamed but it's not advised.