I know the book well and it is a worthy read. Mankind ( and for our lady readers I mean the old sexually equal germanic rootword) is a TOOL using animal. Yes, an experienced woodsman could run naked into the great outdoors and survive. But I garantee when he/she walked out they would possess a flint blade, gathered tinder, animal gut for waterbag, woven cordage and moss lined footwear. Ishii's band perished , because prospectors stole their entire tool kit for souveniers. Look at the clothing and assemblage of the "Iceman" mummie discovered in the Alps. It's all there but the Altoid tin, and just as sophisticated and needed. Getting a tribal tattoo and eating raw lizards while squatting over a smudge fire is more emotional identity. I have a drivers license if I forget that.