If we abuse a dog we have no way to restore it to its previous state. With computer programs we have a perfect time machine, so any thing that one may call "horrible" can be done and then undone without any moral consequences.
This btw also is the answer to the question of evil in religion, god can do whatever he wants without being evil, because it is effectively all in his imagination, and for the people living in our computers we'll be gods.
Because the sufferer is back exactly at the state before suffering, without even a recollection of suffering. And all the suffering was merely number multiplication.
This belief is very, very far from mainstream. It implies that suffering is a complete non-issue in general—after all, we all die and at that point by definition don’t have a recollection of prior suffering (or anything, really).
Since “resetting” is equivalent to killing a being and creating a new being in its place, saying it nullifies all suffering already incurred can take you on a very dangerous path.
This btw also is the answer to the question of evil in religion, god can do whatever he wants without being evil, because it is effectively all in his imagination, and for the people living in our computers we'll be gods.