It may help to understand human affairs to be clear that most of the great triumphs and tragedies of history are caused, not by people being fundamentally good or fundamentally bad, but by people being fundamentally people.
Aziraphale collected books. If he were totally honest with himself he would have to have admitted that his bookshop was simply somewhere to store them. He was not unusual in this. In order to maintain his cover as a typical second-hand book seller, he used every means short of actual physical violence to prevent customers from making a purchase. Unpleasant damp smells, glowering looks, erratic opening hours – he was incredibly good at it.
Along with the standard computer warranty agreement which said that if the machine 1) didn’t work, 2) didn’t do what the expensive advertisements said, 3) electrocuted the immediate neighborhood, 4) and in fact failed entirely to be inside the expensive box when you opened it, this was expressly, absolutely, implicitly and in no event the fault or responsibility of the manufacturer, that the purchaser should consider himself lucky to be allowed to give his money to the manufacturer, and that any attempt to treat what had just been paid for as the purchaser’s own property would result in the attentions of serious men with menacing briefcases and very thin watches. Crowley had been extremely impressed with the warranties offered by the computer industry, and had in fact sent a bundle Below to the department that drew up the Immortal Soul agreements, with a yellow memo form attached just saying: ‘Learn, guys…