I think I would really like to have kids, except most ppl with kids seem to have an unhappier life, no free time, much higher stress, and a worse relationship with their partner. That's a scary thing to willingly enter into.
surely you see the demographic skew though. happy people with families are too busy with their families (and lives) to fill out online surveys. meanwhile unhappy people with families would probably jump at the chance to dissociate
it’s supported by my wife’s & my personal experience, and that of many of our friends… but often only when kids are ~0-3
plus, a lot of that is downstream of how unsupported parents are in general in this society; our marriage got way healthier again after we moved in w friends