It's called discipline....it may appear to you to be stupid discipline but you are entitled to your opinion.
Obeying rules, particularly of that of a school club or what have you develops character, that of which I approve.
Anarchy would develop without rules and discipline and in my opinion it breeds s esprit de corps which I also think is important.
Poor devils, having to spend less than a week (British summer) with long trousers exposed to the trauma that one associates with S.A.S training.
The should ALL be sent home to stay until they decide to wear the school uniform e.g long trousers, or face expulsion.