[nathanaldensr]

Define "intelligent" and "dumb." Ensuring one's genetic line continues could be considered natural--i.e., of nature--intelligence.

[chron9208]

> Ensuring one's genetic line continues could be considered natural--i.e., of nature--intelligence.

Natural selection optimizes for the human species over tens/hundreds of thousands of years. You won’t see a benefit in your lifetime.

Not having kids, well, you see the result in your lifetime (tends to be a slightly positive result).