Agreed, though I know some people who evidently regretted having children, or never bonded with their own but developed "quasi-parental" relationships with children who weren't their own. More than one case, actually!
But I think most parents, in reasonable socioeconomic conditions, don't regret having children.
It is such an extreme social taboo to admit you regret having your children that even if you find someone that does you would never know.