well I have to contest a couple of things, like never hike alone. While it may seem classical caution, its not really much of a problem, and I assume that you are a woman since you caution about men being in the same category as bears and lions. Grrr
Most of your bear discussion seems to apply to grizzlies and there are none in California. Throwing rocks at black bears works. On the other hand, bending over to pick up a rock is considered a bad idea with lions because then they can see how small you are. Probably sprained ankles, dehydration, and hypothermia are greater threats. Feral dogs are maybe the worst animal problem. And in the Mojave there are threats from inhaled fungus spores. Caves should be avoided and mines. Finally falling over cliffs and sliding down talus piles are real threats.
Jim
Jim