Why do some people choose not to have kids?

So isn’t the whole point of evolution to reproduce and pass on your genes? However to my understanding humans are the only species that can make a conscious decision not to have kids. I know people that have willingly never had kids in their life. Is this some flaw in evolution? Since evolution is all about... show more So isn’t the whole point of evolution to reproduce and pass on your genes? However to my understanding humans are the only species that can make a conscious decision not to have kids. I know people that have willingly never had kids in their life.

Is this some flaw in evolution? Since evolution is all about passing on our genes. Is there some evolutionary reason that some people choose not to reproduce? Why are humans able to do this but not other species? Thank you
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