What is Blacklisting?
Why would anybody renounce USA citizenship But please note the Indian Law for OCi clearly states that if you bad mouth India (aka Indian Constitution code word used) you will be Blacklisted.
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I am not sure whether "notdualatall" knows anything about Indian Law... Indian constitution provides "Freedom of Speech" as one of the fundamental rights of citizen (http://en.wikipedia.org/wiki/Fundamental_Rights_in_India)
If someone likes to keep their US citizen, they probably should go ahead with it and if someone else likes to switch to their Indian citizenship, that is their choice. There is nothing good or bad about either of the two choices - Just personal preference!!
No point bad-mouthing any country (India), just because someone has acquired the citizenship of another country (USA).