Others reckoned that as long as the termination was instant, with no warning and therefore no chance that those about to be switched off could suffer, then it didn't really matter. The wretches hadn't existed, they'd been brought into existence for a specific, contributory purpose, and now they were nothing again; so what? Most people, though, were uncomfortable with such moral brusqueness, and took their responsibilities in the matter more seriously. They either avoided creating virtual populations of genuinely living beings in the first place, or only used sims at that sophistication and level of detail on a sustainable basis, knowing from the start that they would be leaving them running indefinitely, with no intention of turning the environment and its inhabitants off at any point. Whether these simulated beings were really really alive, and how justified it was to create entire populations of virtual creatures just for your own convenience under any circumstances, and whether or not - if/once you had done so - you were sort of duty-bound to be honest with your creations at some point and straight out tell them that they weren't really real, and existed at the whim of another order of beings altogether - one with its metaphorical finger hovering over an Off switch capable of utterly and instantly obliterating their entire universe... well, these were all matters which by general and even relieved consent were best left to philosophers. As was the ever-vexing question, How do we know we're not in a simulation? There