And regarding the Ganges, it's a property of culture and policy, not the people themselves. There were American rivers that were literally on fire from excess pollution not that long ago. Policy and culture changed and it greatly ameliorated river pollution problems.
You're the one who brought poor brown people into the discussion as a rhetorical shield from criticism. You can't whine about topical criticism against the shield you chose. If you wanted the criticism to be directed at wealthy westerners, you should've chosen wealthy westerners as your rhetorical human shield, I'm perfectly happy to critique their mistakes, too.