People don't shit in the streets on China. Obviously population has nothing to do with it. You've never been to India; and only circlejerk or perpetuate racist memes on the internet about the country. Nor have you apparently been to certain cities in America; both the deep south and those big "liberul" cities that the news is always droning on about, because the same shit happens there. The only difference is scale; and you're right in the sense that the scale of population and levels of poverty are far different. Reason being?

Colonization. Let's take a look at the dissolvement of the Ottoman Empire after WW1 and how the borders were drawn between the French and the British with a complete and utter disregard for the ethnic make-up and historical constituency of the Levant and Middle-East. Because of their mistakes; the middle-east exists and will probably exist in constant turmoil. India is similar; in the sense that the population was kept under such a level of poverty that 70 years alone isn't anywhere near enough to cover it. Ontop of that; a rapid growing population. Population isn't the reason people shit in the streets though.

Funny enough; the only two countries who have had that much development in 50 years is China and the USSR. Weird how that works right? Look at them now, sadly.