You have obviously not been to Stockholm during morning rush. Stockholm have an extensive subway, as well as buses. Or just using the (often quite wide) sidewalks to walk. The amount of kids moving around (themselves) to get to their schools is almost overwhelming.
Oh, and the best schools are really in the downtown area. Which is why children, kids, teenagers use the public transport from all around the metro area by themselves to get to the schools.
And since you comment further below about winter - yes, of course the kids move around like this in the winter too.
Yeah, seeing 7 year olds taking the subway with their parents, just to change two stations later like any other commuter, is always a fun and cool thing to see.
I take my 6 year old on the train all the time a few stops living in London and have since she was much smaller whats wrong with kids on trains (small children are keen on trains and buses btw).
Back the dqy, my parenrs had 1 hour commutes on foot through some woods to catch a bus for another hour to go to school, and back. Nobody cared, it was normal. Now it is normal for kids to take busses and trains themselves to go to school in cities. Times change.
Oh, and the best schools are really in the downtown area. Which is why children, kids, teenagers use the public transport from all around the metro area by themselves to get to the schools.
And since you comment further below about winter - yes, of course the kids move around like this in the winter too.