in 1984 the indian army forced their way into the golden temple which is the heart of the sikh society. they killed over 3000 innocent civilians, they shot the holy scriptures and yet they ask why sikhs want their own state called khalistan. please research operation blue star which is what they called it.
I think the bigger point here is why would the Sikhs want their own state. I think this goes beyond the question of what happened at the Golden Temple in 1984.
It is beyond dispute that many Sikhs were killed in violence after Indira Gandhi's assassination. You could see why this kind of thing would lead Sikhs to want their own nation.
On the other hand, most outsiders believe that Sikhs have acted as terrorists at times in their attempts to get a separate country for themselves.
From the perspective of an outsider, it is hard to say that India is a society where people are not sometimes attacked for their religion. The riots in 2002 in Gujarat are an example of this. The continuing (though it seems to be going down) popularity of the BJP seems to show this as well.
I agree completely with post #2 that we should not wish for countries to be separated based on religion. But we should also not ignore the fact that religious violence has occurred in India and that there is some amount of a desire among many Indians to have India as a Hindu country.
It is a fact that police personnel entered the Golden Temple to Arrest some extremist Sikh terrorist that were hiding there. Beyond this reality the details of this action given in post # 1 are highly twisted and exaggerated. In particular, army or the police did not kill even a single innocent civilian, and no holy scriptures were damaged or even shown any disrespect.
Also, the justification of Khalistan, that is a separate nation for Sikhs can only be based on aspiration and interest of the Sikhs. The fact is that, in spite of anger over the police entering the Golden Temple, majority of the Sikhs in India do not want to break away from India. Khalistan is a demand of only a handful of extremist and terrorists, most probably motivated by greed for personal power rather than desire for the welfare of Sikhs.
Further, in today's world the, and specially in secular India, supporting formation of new nations based on religions is not an acceptable or wise proposition. Dividing people on the basis of religion has caused enough bloodshed in the past. Thankfully many countries have realized the folly of dividing people on the basis of religion, and are moving away from such practices. It will be a retrograde steps to create a new nation based on religion.