There are tons of options for carrying kids on a bike. Made even easier when you add electric assist.
I can imagine parents not wanting to take the risk of being outside two-tonne metal boxes on the road with their children. Infrastructure matters a lot.
I drop my kids off at school on the way. They bike too. Started with a trail-a-bike, and now they are their own bikes and I bike with them to school on my way.
I bet you live in a different climate than me. ...and your kids are likely older. These factors matter dramatically.