If you zoom out from 1950, you'll see that Europe was already well on their way forward:

The reason China was left behind was because it was imperialized, and the imperialist European countries already had a few centuries of colonialism under their belts to help prop up their economies and fuel advancement. China only began to stand up, so to speak, once it broke the chains of colonialism and instituted grand land reform, requiring no colonialism on its own part to uplift its people.
I agree that democracy is the best form of government, but I'm confused by you linking a bunch of dictatorships of capital. You link settler-colonial countries founded on genocide of indigenous peoples, such as Canada, New Zealand, and Australia, as well as countries like Japan that were either active empires, or receiving massive amounts of investment from imperialist countries in order to profit off of them as vassals.
Democracy means rule by the people, which means the people must control the economy and the state. This is only possible when the commanding heights of the economy are socially owned, as they are in China, Cuba, etc. If a country is dominated by private ownership, then this class is the only one that democracy actually functions for.
You again repeat your zinger equating a socialist leader that doubled life expectancy from birth to a mass murdering genocidal capitalist, but it gets us no closer to understanding why Chinese people love Mao. Historians outside of your western frame of view would disagree vehemontly with your equation of fascism with communism, as it is a core component of Double Genocide Theory, a form of Holocaust trivialization.
You also haven't acknowledged your use of fabricated numbers, deliberately erase context that disproves your own point by only showing data from 1950 onward, etc. What's the point when your dishonesty is so naked?