You most certainly can (and should) expect people (men and women) who have kids to change their behaviour. They're meant to have grown up and become responsible, not continue to get drunk in bars, but now with a child in tow.
No, people do not suddenly “change their behaviour” and “become responsible” when they have children.
Um, yes they do. Most of my peer group and I acted irresponsibly before having children. After having children, we realised we needed to act responsibly, so we did. And wecontinue to do so. As do millions of others.
(n.b. using walls of text does not vailidate a flawed argument).