We need to know what the answer to #2 was first
As a political philosopher, Jefferson favored the rights of states and a strictly limited federal government. This vision was contrary to that of John Marshall, who believed in the need for a strong and broad federal government, capable of resolving the conflicts of its people and guaranteeing the rights of its citizens.
It failed because China is a land of the proletariat and the ruling party is a communist one while the fifth modernization was about introducing democracy. Since the party represents the working class and the will of the people in theory, democracy is against it since it would enable those who are against the party to also compete which would in theory mean that they are against the people.
If your talking about before the revolution here is ur answer just look at the picture attached to this
How people see the world
Some see it glass half full
Other see it glass half empty