Why Not Homeschool???
If you live in an area where your child doesn't have much contact with other children. (ie)rural area.
This is an extreme circumstance of the whole "socialization" issue, if you have minimal consistant contact with other children your child's age........going to school may be a great avenue to provide that for your child. To make friends.
Homeschooling may not be able to fulfill that consistent need everyday, in that scenario. Especially if you also have transportation issues, etc.