In any case, its a fundamental right, enshrined in the Indian Constitution. Its not really a part of the culture, even in highly educated circles. Part of that has to do with the Indian apathy towards Humanities and pursuit of pragmatism over ideology.
It is a distinctly "western" thought (as is "Human Rights"). I actually didn't know whether it had been imported into India, given india's rather "mixed" (east/west) history.
The concept of 'natural human rights' is also a western concept, so no, I don't think we should continue to talk like our (western) way of thinking is the 'right' way, and everyone else is 'wrong'.
Wikipedia lists "western" examples because western canon is very well documented, and this documentation is reliable and extensive enough to quote from.
My readings of Indian history have led me to accept that the freedom of thought and speech have existed, formally and legally, for at least a thousand years - particularly, read up on the times of Asoka's rule.
From my brief look, Hinduism and the Ancient greeks started talking about Freedom (and freedom of speech) at around the same time (~400BCE).
Yes, there are arguments in the Western canon, but when Milton argues for freedom of expression in the Areopagitica, or Mill in On Liberty, they don't argue that you should support free speech because you're a Westerner. They don't make any special appeals to anyone's cultural situation. They make arguments that have universal application.
When you employ reasoning to advocate a principle, it does not become a territorial principle. It becomes applicable pending counterargument from anyone.
The argument that reasoning itself is a uniquely Western idea quickly becomes self-defeating. Anyone asserting anything has volunteered to follow certain logical rules of coherency, which have been derived in the West through observation, not proscription.
Demanding that others be silent, while you alone can speak, tends towards absurdity regardless of the continent upon which you happen to stand.
I was referring in particular to "Human Rights". There are a number of different ways to approach building a productive society. Human Rights are one approach, there are others. Both are rational.
Also, long before Europe became civilized, Indian society (Hinduism) had freedom of speech .
Freedom of speech was ubiquitous feature of Hinduism.