The whole way our society is built is not around pedestrian safety or teaching it to children.
My daughter is growing up in a subdivision with low traffic and no sidewalks and I have to regularly remind her to look both ways when crossing the streets when we’re elsewhere because it’s just not something she has to do all the time.
There’s room for sidewalks, they just didn’t build them. If there were sidewalks, it would be far easier for her to remember to do it every time.