Not to mention men get no benefit out of marriage anymore. I mean there was some book I remember reading on reddit from the 1920s or 40s where women were not supposed to reject their husbands advances. Now you could be tried for sexual assault as a couple ffs. On top of this, divorce universally screws over men.

When you create incentive programs such as divorce, a population doesnt take long to adapt to the institutions horror stories. No marriage means no alimony on breakup. Also no marriage means women wont be as likely to leave if they do not work because of it especially if they have a small support network.

Women have also become more independent. Much like Japan, many western women dont wanna be baby makers. The government kinda forgot though that...well...its kinda important for society. Single mothers increasing helps nobody and dudes are less likely to pay child support when not from marriage.

Overall its been a massive cultural change that will affect future generations significantly. How do you get people to care for a future they arent allowed to create? If anything, apathy to the future generations has been growing since many people dont have children to care for.