Jon Krakauer has suggested that the use of bottled oxygen and commercial guides, who personally accompanied and took care of all pathmaking, equipment, and important decisions, allowed otherwise unqualified climbers to attempt to summit—leading to dangerous situations and more deaths. In addition, he wrote that the competition between Hall and Fischer's guiding companies may have led to Hall's decision not to turn back on 10 May after the pre-decided time for summiting of 14:00; Krakauer also acknowledges that his own presence as a journalist for an important magazine for mountaineers may have added pressure to guide clients to the summit despite growing dangers. He proposed banning bottled oxygen except for emergency cases, arguing that this would both decrease the growing litter on Everest—many discarded bottles have accumulated on its slopes—and keep marginally qualified climbers off the mountain. 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 8,000 m or 26,000 ft). He concludes that decisions made in such circumstances should not be strongly criticized by the general population, who have not experienced such conditions.