Compelling reasons to support the N-deal between India and US
There are many, but K Subrahmanyam has most of the gist in one place.
N-deal: Boon for India, US, world
The very fact that India has a very clean record on the non-proliferation front is good enough reason for the opposition to mellow down their stand. To add to that, it'd be worthy to note that Iran, even after being an NPT signatory, is believed to be a potential source of trouble - a possibly rogue state.
So, signing NPT, after all, doesn't make one holy. All arguments about Bush breaking the "law" should be seen in this context.
India, after all, has a very large energy deficit, and using non-conventional sources of energy makes sense. Or, in other words, the non-conventional has to become the conventional now.