I'm confused, Steve.

You don't reject the science.

but the assertion by the scientist, that there has never been a documented attack of a mother black bear in defense of cubs is something you don't accept.....is not a rejection?

in spite of this lack of rejection (?), and feeling that hikers in the Sierra are at greater risk, you feel that hikers should NOT carry bear spray, which has repeatedly been documented to work to repel bears.....huh?