Happy Thanksgiving, msinc,
Black bears are efficient predators. CA has a HUGE population of black bears. They're thick as schooled trout in the Eastern Sierra. They grow to become exceptionally large. 450 ponders are common. They have an endless supply of food. Campers are a prime source of food for them. They raid fish cleaning stations at night.
My elk guide saw a black bear feeding on a spike bull on the evening I killed my bull. I think they're opportunistic predators. They'll eat what's easily available, including humans.
Thank God, so far I've been either good or lucky. I haven't had to kill a black bear. I avoid 'em. I don't trust them, especially when my kids are fishing with me. A blackie can have everything we have except us, especially my kids.
There's an excellent National Geographic program about black bears that have stalked & preyed on humans. A game warden friend of mine told me to always carrying a handgun while fishing the Eastern Sierra. If a holster-size RPG were available, I'd use one to protect my kids from a black bear. Years ago I watched a fishing show. On it was a story of a Canadian family. A mom was watching her 3 year-old daughter playing on their front porch in a remote area of British Columbia. The mom was inside of their house watching her child through a window. A black bear come onto the porch, grabbed the child, and skedaddled before the mom could react. She never again saw her daughter. I darn near cried.
I had an encounter with a huge blackie involving my then 9 year-old daughter in a parking lot of a marina in the Eastern Sierra. But for our loyal and best friend who detected him long before we did, well, I don't want to think about with could've happened. There's a very good reason our dog is spoiled. He thinks he runs our household. He might be right.
Black bears are more likely to kill and eat humans than griz. People who don't have respect for black bears are potential menu fare for them.
The only animal that troubles me is lion. You can't hear 'em coming. They kill my crushing the back of your neck. All I could hope for is a chance for one handgun shot.
I never carry a handgun while big game hunting. I'll always have a handgun very close by if not on my hip while I'm in camp.
BTW, my game warden friend asked me, many years ago, to climb the back side of Mt Baldy in the Angeles National Forest & kill a black bear. He was having a serious problem with blackies attacking and threatening hikers. He needed to reduce the blackie population pronto. I told him that I wasn't a fool. The San Gabriel Mountains are more rugged than the Rockies. They're straight up & straight down. It'd of taken me a week to pack a blackie off of Mt. Baldy.
https://en.wikipedia.org/wiki/San_Gabriel_Mountains
Samson the Hot Tub Bear lived in the San Gabriels:
http://articles.latimes.com/2001/may/16/local/me-64127 I saw him at the Orange County Zoo soon after he had been arrested & booked (captured) for trespassing. That dude had to go better than 750 pounds. Biologists had his weight at 800+ pounds. He was scheduled for execution (euthanized) because he had no fear of humans. It was predicted it was only a matter of time before he killed someone. Governor Davis pardoned him under the condition of confinement at the OC Zoo.