It's rather astonishing to me that they're not.
To many kids these days have no respect for their elders, teachers, parents. Especially in public.
Very true and very sad. Although I confess that my perceptions on this are neither far-reaching nor the result of a scientific analysis, I haven't noticed such behavior from home-schooled kids.
But on the flipside teachers don't have respect for students, how many cases have there been of rape by teachers lately?
A reflection of the shoddy standards implemented in educating, certifying and hiring teachers, as well as the teachers' unions' fixation upon political correctness....: "So what if Teacher Smith has a history of criminal behavior in the past....he/she has assured us that he/she is a changed person and so it's out duty to give them a second chance"
Boils down to "spare the rod" and HomeSchooling. That is an answer for most these days.