Most of us think what Timothy Treadwell did was....well, mis-guided at the best and plain nutty at the worst, although we all can relate to his love of the wilderness.
I carry bear spray sometimes, esp. on overnight trips or long hikes. Yes, it works - there are studies that show it is very effective if used correctly (short-range, as a last-ditch defense in case of attack).
It's natural to be afraid of bears - that's part of our primordial fears as prey animals

But dangers of bears are over-estimated. Thousands of people have bear encounters in AK every year, and there's only a handful of maulings. Each mauling is front-page news; that illustrates how rare they really are.
Statistically, you're much more likely to be bitten by another Alaskan than by a bear
