The other castes acknowledge that there is a place for each other in a Hindu caste/varna system.
In comparison, the Dalits aren't acknowledged as having a varna in Hinduism.
And the original point still stands, which is that your proposal for another caste to replace the Brahmins won't help the Dalits or Muslims, who comprise 30% of the population.
The underlying premises are as follows:
-Indian political elites have done a terrible job of managing India in the past 60 years.
-Indian political elites are to a large extent Brahmin.
Therefore, you toss out the Brahmins and then you put someone else on top and see if there's any improvement. The idea of India all of a sudden moving to a post-caste society with widespread socioeconomic improvement is extremely difficult.
What's more, is that the most extreme anti-Muslim, anti-Dalit sentiments are often more prevalent among the 'lower' castes. Which isn't really surprising when you think about it. If you have an insane, birth-linked hierarchical society, those who are lower on the totem pole will try to overcompensate by 'acting Brahmin' and target those who are further below them. All the while the UCs are comfortably sitting at the top.
Otoh all the while this shitshow is raging on in rural, poorer section of the society, the urban elite (who run the country btw) are comfortably intermarrying in large numbers!
In this complex multi-layered situation talking about a 'Kshatriya-Shudra' alliance is like saying America's social problems can be solved if there was an 'Irish-Black' alliance. It's a 'not even wrong' tier statement.
Anyhow, I don't want to derail the topic. So I will stop now.
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5% of Indian marriages are inter-caste marriages.
As far as Irish-Black alliances go, funny thing is, in the United States, Black Irish is actually a thing:
. Likewise, some people in the United States believe that the mistake of the Democrats and the success of Trump politically is the result of Democratic politicians favoring minorities (racial injustice) over their own working class (economic injustice) and that if American politicians were to interlink poor whites with disadvantaged minorities, they'd have better political odds.
But you can see the Marxist concept underlying the American proposal, just as you can see the Marxist concept underlying the Indian proposal (i.e, proletariat with middle elites vs upper elites).
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The criticism I'd point to you is this. In a different post, I noted the 6:1 economic disparity between the best performing Indian UTs and the worst-performing Indian UTs. I also noted the 3:1 economic disparity between the richest Chinese provinces and the poorest Chinese provinces / autonomous regions (hint: Tibet isn't in the bottom 3rd), to which Chinese posters became inflamed, citing their anecdotal experience vs my anecdotal experience (I've seen a lot of China from the poorest to the richest).
To what extent do you think your viewpoint comes from a particular view; i.e, from wealthy urban or developed enclaves like the Indian coast or Haryana vs places like Uttar Pradesh and Bihar which are more agrarian or rural? I'm actually a bit shocked you didn't even mention the biggest hole in my proposition; i.e, that Kshatriya are mainly a North Indian thing and the varna registration is barely present in South India.
You may be correct insofar as that I'm overplaying caste prejudices, but I can drag out the real statistics; i.e, the Brahmins make up a very small minority of the Indian population, and when we see Indians overseas in professional modes we are mostly seeing Brahmins. What you've ended up with is a small, reasonably wealthy Westernized elite on top of a more conservative, traditional, and impoverished society.
Do you know what other societies looked like this historically? The Japanese, who got nuked when the social maelstrom they were riding on blew up, and the Russians, who ended up seeing a traumatic Communist revolution. If I'm espousing an anti-Brahminical attitude, I would still say it's good for Brahmins because the alternative is to become White Russians when the social order inevitably erupts.
Moreover, when we see "softer" forms of social restructuring, like with Modi and the BJP trying to use Muslims as replacement Dalits, these are founded on the class and caste resentment of poorer Indians against Brahmin (read: Congress) elites. By trying to manage and control this social transition, where the goal is that Brahmins are reduced to a highly productive, but not politically dominant, minority like Jews in the West, we have greater odds of avoiding the more deleterious populist forms.