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I'd wager those not addressed are more numerous than you think, especially among lurkers.
I'm not confident that this better accounts for the disparity between your expectations and the survey numbers than confused altruists, but the thought occurs.
I didn't think they weren't numerous. There just isn't a point debating morality with someone who says "morality is subjective." I usually leave those people alone.
I don't think I consciously had this thought though, so thank you that actually could be a different explanation.