First off not everyone is even interested in having children. Secondly I don't really see how polyamory would be bad for a kid. They'd just have a bunch of uncles and aunts more than monogamous parents would bring to the table.

> First off not everyone is even interested in having children

Pregnancies happen, regardless of whether or not you’re interested in them

> They'd just have a bunch of uncles and aunts more than monogamous parents would bring to the table.

You’re skipping all the fun parts, like who’s the father? Whose eyes does the child have? Who gives up their leisurely lifestyle to help the mother who is now too busy and tired to have sex with anybody. Let’s say you know who the father is and he’s happily continuing his polyamorous lifestyle - how does the mother feel, who’s now stuck breastfeeding all day and feels like the only committed parent. Etc, etc…

Children introduce a whole rainbow of complications.

> Children introduce a whole rainbow of complications.

Which is why condoms, contraceptives, morning after pills, adoption, and abortion got invented.

You're painting polyamorous folks as if they are having unsafe sex all willy-nilly and care for nothing other than sex. Clearly for most poly folks this isn't true.