There are various reasons for this happening. We see women wanting careers and delaying or putting off marriage and motherhood. We see men not wanting marriage and family.
We could ask why so many young people do not see marriage and family life as important life goals. People work to get educated and work on career goals, but do not work at all towards marriage and family.
I loved my career and I love being a parent. They are both blessings. We need to talk more often to young people about the joys of having a family since they are not taught or encouraged about in school.
Same here, don't understand it. The women we see delaying and putting off motherhood, failed in nailing down a career and became depressed aimless middle-aged women without a husband or even a steady boyfriend. And we also see men who abandoned hope of marrying and they became confirmed bachelors with no offspring. They're all depressed and wonder what went wrong with their lives.
We married young, and built a future together to help our kids do likewise, and are happy grandparents. My wife had a great career while having kids, and our grown daughters also have great careers while also having kids of their own. No crazy liberal weirdness in our families is part of the reason why.