Sure.
Anywhere inside Yosemite, the bears have the upper hand. You can't shoot them, which would be stupid anyways. But they have no fear. In campgrounds where a truck can get in to install it, there are big steel lockers. But in the high country, the only bear proof is a cable about thirty feet up between two trees, and a long pole and hook to hang your stuff out in the middle. But that's easy work- they send up a cub.
Why I mostly hiked outside the Park, where at least the bears have some fear of ranchers and pack train cowboys who carry rifles.
One time though, way up high, I woke up at crack of dawn to yelling outside. Guys next tent out and running around. Rolled over in my bag and got up on my elbows right when the big basterd stuck his head and shoulders right through the door, took a look at me and backed off.
I jumped out, my tent roomie jumped out. The bear ambled off. Dusting ourselves off, my roomie admitted he'd brought a bag of M&M;s in his bag in case he got hungry.
But those guys are brown bears, not Grizzly Bears. And while those are all gone, and I'm a strong environmental supporter, I don't think we all much are the worse for their absense.