Kennith, at the risk of getting drawn into a long discussion with a master debater, I beg to differ with you on the "length of gun/speed of draw" issue.
I appreciate your view to practicality, and in a different environment I would agree with your points. If we were operating in the jungle or uneven terrain you would be spot on. However our working terrain is wide open, flat as a pancake ice sheet with sight lines for miles. No polar bear is going to jump out from behind a rock and pounce on anyone. It's like one giant skating rink. If we see a bear during the day while we're working, we'll see it from a long ways off. Speed of draw is not going to be an issue most of the time.
If a bear comes into camp at night while everyone is in their tents then it will just have its way with the place. We had 17 people in camp in 11 tents with two firearms. Sooner or later someone would be able to lay their hands on a weapon and make a decision about opening fire, but by then it's almost too late.
From a practical and budgetary standpoint, we are not going to arm every single expedition member with hand cannons. The Coast Guard is not a fighting branch, and while there are specialists within that service who are accomplished marksmen, the Coasties on our trip either had desk jobs or were SAR, surgeons, pilots, and public relations officers- none trained in firearms. The civilians, like me, were mountaineering experts, mechanics, journalists, and scientists. We only had 2 people who were truly qualified and experienced in firearms, a former US special forces officer and a reservist fresh back from Afghanistan.
The terrain was, and remains, our best defense against bears. If I go back in the spring we'll be camped even further inland, so we'll have a better position still.