What was your tuition? How different would your life have been if you graduated from B school having to pay $1,000 a month (or more!) in loans?
The barriers to starting a family with children are staggering these days. Many people have to choose at age 18 whether to accrue a massive pile of debt in the hopes of obtaining a reasonably good paying job, or forego the debt but limit their lifetime earning potential. Obviously, there are other ways, but if one ends up working and going to school at the same time, they're either living at home and delaying their social development, or still accruing debt while delaying any meaningful advancement to a place where they can realistically afford to start a family.
If you want this to change, don't lecture people on how they can make different life choices. Those choices don't exist. We need to drastically reduce the financial burden people face at the beginning of adulthood. We also need to drastically reduce the financial burdens people now in their 60s face too, because you know why? "Free" child care with a family member doesn't exist any more either, because grandma and grandpa and great Aunt and great Uncle also have to work until they die, because they stopped earning a pension 30 years ago and Social Security will barely pay enough to feed and medicate them if they stop.