Sounds like you just don't know as many different types of people as you think you do. There are plenty of people who drone on endlessly about how children are nothing but a blessing, how perfect parenthood is, and a bunch of other lies that they may or may not actually believe.
Than you don't know my ex who almost popped a vein when I said "the burden of the kids is on my shoulders" and she started making like it was blasphemous to think or say that about kids.