I teach Sunday School & I have a little girl in my class (homeschooled) who is very behind socially, she has trouble following basic instruction & she is very overwhelmed working around other kids.  I also feel kids need to know how to deal with other kids of different backgrounds & of different social and economic classes.  It is that way in the real world, and I think it is very important to learn that all through school.

I mean no disrespect with this answer!