Sometimes people are the food.
Very seldom with the Black Bear. They deserve respect, but are nothing like a Grizzly. While they can become aggressive, they typically are timid scavengers.
I have lots of experience with these types of bear, having spent a good portion of my youth backpacking throughout the Sierras. I've had bear encounters, including a time when a black bear walked into my camp in the middle of the day and walked off with my fishing bait. In that case, I stupidly left my supplies unattended for two minutes and chased him off by banging on a pan.
I've seen these type of bear break car windows in parked vehicles in order to acquire food. While I know over the years there have been a couple of reports of a bad confrontation, these bear are easily dealt with by just being smart, and using the food storage devices located throughout the Sierras.