Jim, as I said elsewhere, I think a lot of people have the "if it doesn't have a fishing kit it can't be a survival kit- see, the manual says so" response, while holding up some military survival manual. It's marketing.

There may also be some of Doug's theory that a fishing kit will keep them out of trouble when they get bored. But also, if they get a fish hook out they are probably more likely to bring their camp closer if it turns into a multi-night affair. That will probably make spotting the Heatsheet from the air easier becuase you are less likely to have as overhead concealment along a river or pond. So there may also be some psychology involved.