Today they expect the teachers to instill proper behavior, along with everything else.
Believe it or not, pre-school programs do work. Kids learn their numbers, colors, how to work, ect,ect, and how to behave/function in a socially acceptable manner.
I have seen way too many dysfunctional kids crawl under their desk and cry for mommy, urinate in class, refuse to behave, and just haven't learned how to function around other kids. They need to learn this when they are 4 & 5 not in 3rd grade. We all did and before we entered 1st grade. IT all starts in the home, you know.