Just a counterpoint : IITs are state funded, i.e most of the student fees are paid for by the government. Once they complete their education, do they not have a duty to give back to the people ? Remember, brain drain is a serious problem for countries like India.
> do they not have a duty to give back to the people ?
I hate this attitude, not just in India, but anywhere in the world. Like Kennedy's "ask not what your country has done for you...". To start with, their own parents paid taxes to support the IITs too. Do we have a way of making a balance sheet for how my taxes were utilized? How much have I lost to supporting corruption? How much have I lost to supporting undeserving candidates who got in through reservation?
In case of IITs, you are, of course, neglecting all the private funding it gets.
> brain drain is a serious problem for countries like India.
Many Indians who have left have gone on to accomplish great things. Do you think they would have accomplished even 1% of that, had they stayed in India? Brain drain is not India's problem; it is an avenue for opportunity for many Indians. India's problem is corruption and unfettered democracy.