The requirements, though, do not give the students or parents any additional "rights" that the other students have, nor does it give them more room to "complain". Those requirements clearly state the student mus follow all rules of conduct, and parents must be involved if the school requires it. Those two provisions turn off many parents in the first place.
Bottom line is: Only parents who care about their children's education are going to take advantage of this program. You will not have parents with whiney brats trying to sue schools into submission over petty things they could get away with at a publc school. An atheist isn't going to send his/her child to a private school, and demand they change things and accomodate his/her beliefs. Those types of people don't last a week at a private school. Their children are miserable because no one likes them, will talk to them or be their friend. Kids are good at enforcing such "social order" in public schools.
Vouchers are not scholarships.