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I don't understand how we can all be errors if, as marquisedemerteuil said, we are all fit enough to survive.  Also, if we were all errors, we, as human beings, would be wiped out, as evolution doesn't favor errors and tries to eliminate them over time. Then wouldn't we all be dead by now?

Furthermore, I do think that fixing errors does, usually effect an entire community.  For example, treating diabetes or the error that causes it still affects the entire diabetic community, and that is not something that is considered to be bad.