The page I've linked to describes a party of sixteen excellent skiers who went on a trip where they easily could have known better. Three of them died. It's common knowledge that large parties increase the risk of avalanche, but the page described the group excitement which no one managed to override.
One skier was sufficiently uneasy that she avoided the danger, but she didn't speak up to discourage the group.
This isn't the most difficult sort of situation requiring rationality, but it's far from the easiest, either. Any suggestions or work from CFAR about improving the odds of speaking up when a group is about to do something stupid?
The article is heavily multimedia, with big self-loading animations-- it's gorgeous, but it's a bandwidth hog.