The same reason everyone else in the world does - so things look neat and tidy.
Because they want kids to have responsibility and to have a clean school
"Clean" is 'kirei' in Japanese.
yep all Japanese Canadians
yes
Yes, Japanese tap water is safe.
No. Japanese kids make origamis.
3:00
they walk
Discipline is a big part of Japanese culture so the kids know not to misbehave, unlike our own free do as you like culture.
because its dirty?..
See: Japanese American internment
kodomo