is river and stream pollution as bad in the rest of the developing world as it is in India.
It's not as bad in India once you are out away from the large cities or if you are not downstream of a major city or industrial area, at least in the rural areas we were in. We spent most of our time in West Bengal and the Himalayas, so what we saw of India is about the same as visiting Rhode Island and saying you've visited the U.S.
For the rest of the developing world that we've visited, water pollution (trash, chemicals, etc.) varies widely by region. Again, much worse in and downstream of major cities and industrial areas. Rural areas are not so bad to very good to pristine depending on the area. China was incredibly polluted everywhere we were in the rural and urban areas, but again, we've only been to a bit of China. Hope to return there as well.
One other comment; As troubling to me as the pollution of the waterways was the social pollution of the caste system. It seemed all pervasive and to my mind, a crucial component of why India is the way it is. The vast and overwhelming difference between the rich and poor is justified by caste/karma/religion/philosophy. Marx thought 19th century England was bad. India is worse. I lost considerable respect for south Asia's cultural traditions in my trip to India. Did you have a similar experience?
Your experience is not uncommon for visitors, and not just those from post-development economies in developing economies. It's more about anybody visiting a foreign culture.
Consider your cultural norms and your accompanying expectations as a pair of goggles. When you've got them on, everything you see and experience passes through those goggles and gets compared against everything you've ever experienced and everything you've been taught that represents what is "normal" and "right." When you're wearing your cultural goggles everything you see and experience gets tinted.
To truly experience another culture you must remove those goggles. It's the only way you can see and experience that culture for what it is, without passing through a filter that colors everything.
It can take some time to get there. It can take some visits to multiple places. And it definitely takes work, every single day, to pull those goggles down and just experience a place that is radically different than what we consider "normal."
It's not easy to adjust to a place where beating a mule savagely is OK or a place where every child's life path is determined at birth or a place where inter-generational sex is normal. It's not easy to keep those goggles down in those places.
But if you can, it gives you a chance.
For me, I just try to approach every new place, every new culture, with an outlook of learning, of just being there to learn.