 He does point out, however, that climbing Everest has always been a highly dangerous endeavour even before the guided tours, with one fatality for every four climbers who reach the summit.Furthermore, he notes that many of the poor decisions made on 10 May were after two or more days of inadequate oxygen, nourishment, and rest (due to the effects of entering the death zone above ).He concludes that decisions made in such circumstances should not be strongly criticized by the general population, who have not experienced such conditions.