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Single people usually have more time on their hands, so they may be willing to work longer too. Is there something wrong with only wanting to hire single people?

Depending on why you do it, yes. Believe it or not intent matters.

And I also generally believe it's bad, because it breeds a toxic and self-eating culture.

Experienced people might produce better results? Have a greater understanding of the larger picture that makes a business? And people with kids were shown to have higher retention. If the youngsters move on with the tribal knowledge, what was the point? My .02, no proof that we should respect our elders.