For example, if I lead a group down section IV for the first time, and I don't explain anything to them, do I get in trouble if they go right at Crack in the Rock and die? I think so.. But that's just my opinion.
I have no idea what happened on the Blackwater, but it sounds like someone may or may not have been adequately informed about a section of river that was really dangerous. If he was, and his death is due to a lack of skill, then that is a totally different scenario.