Karl Zedong?

Why? You should ask all the time, you hear,
Why are the sky so blue and the water so clear?
Why there is hate and love is so scarce,
Why is mother so smart and father an ass?
Why the cat meows but the dogs do barks,
Why was Mao Zedong, but Karl was Marx,
Why looting a store is asking for justice,
Why a rich man is a man of much substance,