What are the main reasons people use humor and costumes as a form of political protest in the US?

Why didn't Romans take more precautions focused on stricter security to deter future rebellions following the first Servile War? Why did it take 3 slave rebellions for them to learn the lesson?
Why is understanding the basics of quantum physics so crucial before diving into quantum mechanics?
Why have I never felt attracted to men in my country whose main language is not English? I love reading romantic novels or watching romantic films in English though.