Overpopulation is a problem.
Lack of procreation (in moderation) is a possible solution to overpopulation.
Ergo, lifestyles that are not traditionally associated with procreation have a moral benefit to humanity, or are at least value-neutral.
(This is how I justify my childless state to those who think such a choice is sinful.)
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per·son \ˈpər-sən\ (noun) - an ephemeral collection of small, irrational decisions
The fun thing about evolution (and science in general) is that it happens whether you believe in it or not.
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