The discussion was about people stopping power, not bear stopping power. Few people have to ever fear 4 legged creatures.......it is the 2 legged variety which is dangerous.
I have occasional bear problems where I live. Had a black bear right by my front door at noon about two weeks ago. My SD has to include them. I have not had to shoot one yet, but I have to take off my shoes to count the encounters I have had. I had two two legged encounters when I lived in Florida, but here in the Colorado Rockies I have only had bear problems, though moose and mountain lion are possibilities too.