You don’t think that people who bear hunt and serve as guides on bear hunts are experts?
You don’t think that those who live in AK are experts?
No. Sarah Palin is not a bear expert.
Hunters and hunter guides can provide good information but keep in mind these are people armed with guns. What experience would they have with bear spray?
Even then their stories aren’t scientific studies.
If you want to know what gun to carry when guiding people out bear watching talk to psycofreep.
If you want to know if bear spray is effective read the studies.