Not everything has to be linked to "attack", these grass roots take place and a times they take a few years or over a decade. But when masses of people show up on streets is when the other side would have a "holly shiit" moment. Like the Arab spring and many other events throughout the history.
Sikhs were betrayed by late Mrs. Bhutto. Otherwise, I'd strongly guess that by now, there would've been an independent state for the Sikhs, or the Punjab would've turned into another Kashmir.
It is interesting that outsiders know so much about your country, isn't it?
Next, TRUST me, I know what I am talking about Sikhs of India are like Pashtuns in Northern Pakistan. Both of these ethnicities have serious culture in their rituals, their own customs, rules and regulations. You simply can't change it, overwrite or suppress it.
I know plenty of Sikh businessmen in US and Canada and a few kids back when I went to school in. They aren't letting go the idea of their country. They were betrayed by Pakistan's late Mrs. Bhutto and since then, they've been working on creating a mechanism in terms of a movement that when the masses hit the streets of India, they wouldn't be depending upon the support form the Pakistani end so no one can betray them again.
There is a saying that all looks peaceful, good and very quiet RIGHT before a massive storm !!!