Consider a typical afternoon commute for a parent - you go from work to your kids school to some after school activity (different destination every day) to a few grocery stores then back to the after school activity and then finally home. If you have three kids... now you're going to three afternoon activities. And maybe two schools as well.

Sounds like it'd take about 5 hours with public transit, especially since for some of those you'd literally be getting off the bus stop, then 5 minutes later be back at the bus stop waiting for the next bus. Kids aren't allowed to wait at bus stops these days... whoever is looking after the kid will only release them when the parent comes in to pick them up. Often the parent even has to type their password into a system that checks if they are approved to pick up the kid (most kidnappings crimes are committed by family, often a parent, and staff aren't expected to keep on top of that... so they use databases).

I love public transit. But major cultural changes would be required for it to be my main form of commute.