Is it fair to punish the whole class?

Have you ever been in a situation where someone did something wrong, but didn't own up? And then the teacher punished the whole class until the real culprit confessed! Is it fair for a whole group to be punished for something one person did? Molly, Carl and Matt go back to school to find out.

Brains Trust — Somerset College in Queensland: Ethan, Saeesha, Spencer, Maddi, John, and Harry.