The grizzly, as a top predator, was not really very afraid of humans and many people were killed by them in California before they were hunted to extinction. I would definitely not want them around as a farmer in the 1800's. With antibiotics, helicopter transport, and ER rooms today, I might support a reintroduction of grizzlies to the state. There is one on the state flag, after all, and are amazing creatures. On the other hand, I like how relaxed I can be hiking in the California Sierra without them. Hiking and camping in the Canadian Rockies feels a lot different.
Mountain lions (at least the ones evolved when we hunted them for the last 12,000 years) are much less hazardous to humans than grizzlies or wolf packs.
We have an urban coyote population in Vancouver. It's very strange seeing a coyote in the city. I was 20 feet away, once. They are amazingly beautiful creatures.
The people decided it was better to live with mountain lions instead of killing them off in 1990, after we killed off the grizzly and the wolf in the state. http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?...