Appreciate the understanding of Pakistan's delicate situation, however it would be folly to think that India still does not harbor animus towards Pakistan. There is no understanding on Kashmir, nor is there alignment on China's influence within Pakistan. India's alliances within the region also can be taken in a hostile vain, and hardly reflect legitimate domestic interests; a military alliance with Iran, and peddling for influence in Afghanistan.
Destabilizing Pakistan is not in India's best interests, however destabilizing it with a western presence may be thought to serve as a catalyst for the de-nuclearization of Pakistan. A clean break-up of Pakistan may also serve Indian interests, what's more by factions friendly to India.
I would like to believe Indian analysts, though. However, Pakistan can ill afford to think India will not attempt to be the regional hegemon.
Particularly with the tail end of the previous Indian administration and in the current administration, the calculus on Pakistan has changed. The centre in India is no longer in the North. Certainly if one considers Mumbai to be South, the argument could be made that the centre in India has always been in the South.
Much of the animus, that India had, was because of the domination of the North in Indian politics, culture, and economics. That, there were Indian leaders that were born in present day Pakistan, had fought wars, shared a common Punjabi culture added to this. That is no longer the case. South Indians have nothing in common with Pakistanis, save a common love of cricket. We don't share a common language, culture, and there are no pre-partition bonds. If you consider the educated younger generation, having animus, as such, towards Pakistan is a non-issue.
India, spurred by the South, is concerned with one issue: economic development. That development is moving from the South to the North. The vast majority of India is impoverished. It's illeterate. It's being ravaged by diseases like AIDS. There is a Maoist insurgency because economic development hasn't made it's way to impoverished states like Bihar. North India is horribly corrupt.
India is a third world country that is making fast progress. States like Kerala in the South have
%100 percent literacy. Infant mortality rates are below developed countries. Bangalore, in Karnataka, is the hub of Indian business. There is no Maoist insurgency there, corruption is low, and it's quickly being developed. Indians like the Chinese know that economic development is the primary security concern.
In this environment, India does not see Pakistan as a partner. The biggest concern India had was a fragmented Pakistan in turmoil with control of it's nuclear assets in limbo. India was willing to go quite a bit to see that not happen. There was no military action after the attack on India's parlaiment. India kept the Iran-Pakistan pipeline plan alive, hoping the right mix of incentives would shape Pakistani positions.
Now everything India feared has come to pass. With the US guaranteeing safety of Pakistani nuclear weapons, there really is no reason for India to deal now. There is no government in Pakistan that can make a peace deal. The only thing for India to do now, is sit and wait to see how Pakistan's internal conflict plays out.
Still, with the hope of the 'non-paper' agreed through back channel diplomacy with Musharraf and with the approval of the Zardari government, the Indian government, at considerable political heat, did not take action after the Mumbai attack.
What India wants is transit routes through Pakistan. It wants a market in Pakistan for it's goods and services. It wants Pakistani farm goods and textiles.