We are left deciding what's good and evil because if we don't, who will tell us? And even if someone did, how could we trust them? The nature of morality is such that everyone has to decide for themself, at least to the extent of deciding who to listen to. If a god has some higher purpose, they should explain it to us, and if they can't explain it in a way that makes us agree it's not right.

Just because feedback loops happen doesn't mean they're a good thing even when they happen to animals. We should be exempt under EY's definition of should, and anyone who disagrees is either using a different definition or is just not worth arguing with.