When you get to 1 billion, your representatives will be as callous. (Already on the way there, actually.) Government is just a mirror of the people, even in China.
Only two countries have gotten to 1 billion inhabitants, and I'd say that the government of India is much less callous or calculating than that of China.
The founders of Communist Russia intended that the state be dissolved by 1980, that it be replaced by councils that work together in coöperation, such that everyone has a say. Did that bear fruit? No.
Did the founding fathers intend for the United States to spy on every single one of their citizens? No. Does it happen? Yes. Did the founding fathers intend for the state to be able to detain foreigners of the US indefinitely without trial? No. The patriot act allows it, however.
You cannot judge a country by founding principals and safeguards alone, they are easy to repeal and change; you can only judge a country on the current legislature and how much the current Constitution constrains the government.