Why is there this deafening silence and apathy by the rest of the social justice movement?

Because Indians are the wealthiest racial group in the country. Democrats like to target poor minorities with their virtue-signalling programs because it's cheaper to buy their votes.

Edit: Sorry. Dems good! Pandering to minorities is good! How else will they know who to vote for?

The bill is opposed by the Hindu American Foundation. They give their rationale for opposing the bill in:

https://www.hinduamerican.org/wp-content/uploads/2023/04/HAF...

They state:

"We share the admirable goals of protecting civil rights and eliminating all forms of prejudice and discrimination, including based on caste. As such, the question is not whether we deal with allegations of caste discrimination, but how. If and when caste discrimination allegations emerge, they should be adjudicated under the existing protected class of ancestry, just as the state of California did in California Department of Fair Employment Housing v. Cisco Systems, Inc."

They state in https://www.hinduamerican.org/wp-content/uploads/2023/02/Cas...

"All of these measures can be traced back to allegations being made by a for-profit, activist entity called Equality Labs which stands to profit from its caste competency training services."

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I'm inclined to agree with them that caste discrimination is probably already illegal on the basis of ancestry.

(Unfortunately laws themselves don't eliminate prejudice.)

The main opposition is from the Hindu American Foundation, which has strong links to the Hindutva party governing India, (the BJP), which is affiliated to RSS, the extremist paramilitary Hindutva organization. You can probably understand why Hindu supremacist organizations would want to downplay or deny the negative effects of caste.

I doubt that. The Indian constitution has far stronger anti-caste discrimination provisions than Cali. The BJP has never tried to remove those, so why would they want to do anything here?

Bigotry towards other Indians is unfortunately a common and global thing among Indian diaspora. So is nepotism. Many organizations and Indians in powerful positions have benefited from both.

Would you support a bill banning Jewish blood rituals?