Public schools set lots of rules but never bother to enforce them. So scratch that one from an honest complaint. Many private schools have the rules clearly outlined in the entrance paperwork and the parents and students must sign the list indicating they understand them thoroughly. Suspension is used as a good incentive to follow these rules. Expulsion is used when suspension doesn't work.
Tuition is non refundable to keep the parents on their toes to ensure their kids follow the rules.
This may seem cruel and extreme to many parents and they are invited to stay in the government schools where rules are just words on paper. Keeping the physical facility in safe condition seems to be a problem within many areas of America. I have read where several schools are actually harmful to the kids. These are very rare and certainly not valid reasons for most teachers to use. Private schools are responsible for the conditions of their campus and many times use the students to keep up the cleanliness of the classrooms and play grounds.