Only 'have to' suggests an obligation/rule that is obeyed. 'Should' suggests an obligation/rule that may not be obeyed.
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AnonymousWhat makes "should" incorrect here?In this context, 'should' expresses an opinion that a certain course of action is good. It's anomalous to express an opinion about only some students, but not others. Why would someone find the wearing of uniforms to be a good idea in most EU countries, but not in all of them? If it's a good idea, i