This reminds me a lot of Get Tough by William Fairbairn where he describes the psychological and practical advantages of having a small stick as a weapon if no other weapon is available. I wouldn't want to have to fight an animal or another person with an improvised spear, but if I found myself in a survival situation one of the first things I would do is make a spear or club to carry. In other places I've seen people discuss rabbit sticks, and I think its a good idea to carry a weapon you can defend yourself with or throw at game if you have the opportunity. If nothing else the psychological value of being armed should add to your ability to survive.