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What if we're an alien race who wipes our own memories then lives the lives of other races to learn about them, but we're only supposed to experience the good parts of their nature which is why there are so many systems in the simulation disincentivizing violence or negativity.
Because we haven't figured out how to remove negative choices from the "game", but we understand that shit isn't what we want to absorb from other races, we want the best of them, the worst is discarded.