sure they could, but it would result in an all out civil war within their own country and I don't think India would risk such an attack
only if Pakistan was to be the aggressor
Indians and Pakistanis enjoy extremely close relations, regardless of what goes on between the governments of the two
considering the US is rushing a fleet of bunker buster bombs to Israel rather than getting their own people out of harms way is a clear sign that they're going to stick with that stauch "ally"