Who would agree with this quote? "a revolution is no picnic. we must eliminate capitalism and emperialism even if thousands have to sacrifice their lives."

This statement is typical of someone who is an opponent of capitalism and imperialism, would mean for someone who is a communist, socialist, utopian, or anarchist. With this statement, Mao Zedong would agree, because he was the leader of the Communist Party in China, while the others options are offered, all of them are Americans, were hardly ever to agree with this statement, which is completely opposite from the value of capitalism and democracy.

the answer to your question is a because laws act as guidelines as to what is accepted in society. without it there would be conflicts between social groups and communities. it serves as a norm of conduct for citizens.