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Even in their homelands, they face a significantly stricter scale of class system. And this has been historical! But a large, practically unnoticeable segment of this plight carried over the backs of their people through their history, similar to China, is in how their people became what they are today. Genetically. Rulers lowering city walls and allowing certain peoples to mix, their blood although not much different, becoming more of a melting pot. Slowly, and sure enough, you have a mass of nearly the same person.
Secondly, the breaking of spirit. Although their people's history stretches towards ancient times, spiritually, their pantheon alludes to a divided spirit. But is it any different than what came after Hinduism and the caste system? A spirit divided in the people over thousands of years generates plenty of conflicts within the design and makeup of a person. Although a spiritual people, there has been too much to lead their intelligence from whence it held more significance. Which beckons the question, from where did the elders in society break away to instead of continuing to guide the populus? Perhaps they too were so deprived in their desires after so long to where depravity became harder to stave off.
Lastly, the mind. Being in IT before (been 6-7 years being in retail), I concur with what you say. It's as though you're talking to an alien. Whether a developmental problem or genetic deformity, it's all too commonplace to find someone who is indian being incompetent of certain elements.