There are plenty of elements in the Indian polity that can't be trusted - all of them with not insignificant political power. That right now a coalition of pragmatic nationalists hold power in New Delhi means
nothing as an indicator of who will hold power there in the future. Indian politics is volatile, as you (presumably) know. Some of those elements to look out for are..
- the right-wing swadeshi crowd, an Indian version of the Buchananites. Cultural conservatives, they hate foreign influences of all kinds. They are a strong, but currently sidelined, force in the BJP.
- The left-wing crowd, basically socialists and communists. They are a strong force in the main opposition party (the Congress), and are the driving force behind many of the smaller parties on which any future Congress-led government would look for support. They hate America/capitalism as a matter of doctrine.
- The populist crowd, politicians whos appeal is based on being against the Indian elite; this almost always translates to being anti-America. These people have an alliance with the socialist crowd. They hate America, and due to their dependence on the Muslim vote, they will hate America even more, if a Congress-led government were to come to power that depended on these folk for Parliamentary support.
Bottom line, there is plenty of reason to doubt the continuity of Indian foreign policy. It is still hostage to their domestic situation, so they can not be trusted. Nor can the Pakistanis, but you already know why.
The parallels you draw in themselves support the democratic nature of Indian politics. If you are saying we can't depend on India being an ally, it is understandable, based on history - although alliances now have a whole new basis and motive. But it does not amount to a question of "trust" as in the case of Pakistan! It's a big mistake to think that these two countries are the same! I notice you referring to the Indian press frequentyly enough. How often do you refer to the Pakistan media and why not?