Hindu culture was not going anywhere, it desperately needed an injection of rationality and a forced demonstration of good government. India is on a very good path now and it owes most of that to the British. The British used raw force to reform Indian culture away from degenerate, irrational religious fatalism toward a progressive, modern approach to life.
Anyway Indian culture today is unrecognizable compared to pre-British India. The most important part of culture is the approach to law, property, government, and individual rights, and these are the fruits of the British Empire in India. Underestimating these crucial factors is very easy now that you are reaping their benefits. India today would look like Somalia if it wasn't for the Empire.
In 19th century India the British really did reform the savages. They ended wife burning, vigilante decapitations, cannibalism, among other savage but accepted cultural norms. They significantly curtailed the systematic corruption, clarified property rights, introduced representative government, paved the way for social mobility, and are really solely responsible for the slow turning away from pernicious Hindu mysticism -- which is the bane of civilization. Hindu mysticism is really the most damaging kind of irrational religiosity on Earth and causes tremendous suffering and poverty.
The Brits were surprisingly generous given their global hegemony. It is easy to argue that the American Empire is more exploitative and uncaring with respect to their colonies: and the American Empire is less powerful today thanks to the liberalizing influence of the British who themselves foresaw independence for every colony, often before the colonies did. The positive effects of Rhodesian foreign policy should not be underestimated.
It's popular to hate Empires but there really is nothing romantic about cannibalism, institutionalized irrationality, rigid caste systems and all the other savage cultural features of many parts of the world before the age of sail. For all the faults of the British, we often forget just how good England and her colonies had life in comparison to the alternatives.