Copyright © 2008, Doug Wade
Look at those claws. That's part of why bears are so dangerous - they don't have to want to kill you to do serious damage - startle one and there's a decent chance they'll smack you one with those claws and run for it. But that one smack can do a lot of damage. And of course that doesn't even touch on what happens if you're near a cub and they can't just run away.
They're beautiful animals but you have to respect them from a nice distance.