As a further comment, regarding the idea that you can "unplug" a simulation: You can do this in everday life with nuclear weapons. A nuclear weapon can reduce local reality to its constituent parts - the smaller pieces that things were made out of. If you turn off a computer, you similarly still have the basic underlying reality there - the computer itself - but the higher level organization is gone - just as if a nuclear weapon had been used on the simulated world. This only seems different because the underpinnings of a real object and a "simulated" one are different. Both are emergent properties of some underlying system and both can be removed by altering the underlying system in such a way as they don't emerge from it anymore (by using nuclear devices or turning off the power).