&gt; It&#x27;s not that simple. If your people won&#x27;t breed, your civilization will die out, along with all its values, culture and legacy.<p>This assumes the obviously false position that culture, values, etc. are transmitted genetically, and exclusively so. If you want to assure survival of culture, you need to assure the spread of your memes; spreading your <i>genes</i> isn&#x27;t essential.