text: The principle might not be able to offer all the classes the students want. There might not be things students want to do. If you didn't offer enough classes of different variety, students would become angry and upset that they couldn't offer the classes they wanted. Some people might not like the classes you offer to them. Some people are not into sports. They might not be good at art. There wouldn't be anything that students like. So then they would be forced into something that they don't really like or are not good at.