What's the west have to do with this? We can discuss the topic of casteism from a Sikhi framework between ourselves that's nothing to do with the west.
Plus you're wrong, the west as a norm tries to breakdown structures of all indigenous people they encounter.
Yes, because they fell on their knees and lived like sycophantic, subjugated rats for a long time. They became the play things and tools of conquerors and collaborated with them to survive, shitting on their own that they deemed beneath them in the caste hierarchy, because they weren't manly enough to take on their enslavers. That's how Indians got their renown timid, coward 'peace-loving' reputation