That’s not how it works. There’s a long line of diplomacy that
countries need to follow. Given Indian Government is more sensible that Pak’s, it
won’t really go all-out attacking Pakistan. India won’t wage a formal war
against its neighbor.
This whole issue is not just only about India and Pakistan. Other
countries, indirectly, are involved too. Like Pak has full support of China.
And India gets along with USA very well. If something big really happens
between the two neighboring countries, the wholes global scene can see turmoil
in one way or other.
Plus, India holds a moral upper-hand on the global platform. The
world knows what Pakistan do, their tactics, how they foul India on every
front. And the world knows just how sensibly India reacts all the time, without
getting carried away in the heat of the moment. So yes, India has an upper-hand
in this whole issue.