Same question can be asked in a variety of endevours. Like Cloning of animals and humans.
Currently, approximatley 130 species become extinct every day on this planet. We usually become concerned when it comes to something cute, like a Panda Bear, or popular like Whales or Sea Turtles. We don't think too much about the beetles and flies, etc. My wife is a wildlife biologist and botonist and her main job is going into the field every day to count how many of each "listed" species are still where they hope they will be. Her job is mostly plants, though she does do research on flies, pond turtles, etc. Last year, I had the opportunity to go into the field for a few consecutive nights with a scientific researcher to find out if the Kangaroo Rats were actually using the culverts under the freeway systems to go from one side of a freeway to the other to breed. We did this by capturing the K-Rats in traps and taking fur off of their rear ends for DNA tests. I couldn't believe how much fun it was.
As far as reintroduction.....I don't think the Grizzly project has much traction. For this to actually gain momentum, you need more than ONE person trying to drive an agenda. But reintroduction has worked fairly well with some species, such as the California Condor in Big Sur and several projects in Colorado, including the Lynx and Moose. The Bald Eagle has been reintroduced successfully in several states, including Catalina Island off the coast of California.
Back to Grizzly Bears. I certainly believe I could support the reintroduction of Grizzly Bears. The chances of any of us seeing a Grizzly Bear ever in the state of California, even after reintroduction would be astronomical. People have the same concerns about how dangerous Mountain Lions are. I've hiked several hundred miles in the Santa Ana Mountains, which have a decent size population of Mountain Lions, and I've only seen one in the last 14 or so years, and that was while I was driving home from a hike. And I KNOW I walk by Mountain Lions all the time as I not only see signs of the Mountain Lions, but signs of the researchers trying to place transponders on them. As far as danger from Grizzlies. I think this puts some of it in perspective: I understand that since Yellowstone became a Park in 1872, there have been over 300 deaths in the park. 5 have come from Bears. Four were confirmed Grizzly Bears, the other bear was not identified.
"Turtles, Frogs & other Environmental Sculpture"