Lets walk through this, india and pakistan launch full scale conventional war against one another. No sane country would start nuclear war right out of the gates. You want them to wipe one or the other off the map, so lets say india is winning. The Pakistani government realizes that they
will loose this war and the leaders of which will most likely be executed. The idea of MAD flys out the window at this point, this is where theres a chance of 60 nuclear warheads flying into india's major cities.
Very rough math puts that at a death toll of more than 24 million people(civilians) from the inital bombing alone, and thats not even considering the death toll of the full scale war between two countries before it. The combined death toll from WWI was 15 million.
And as far as fallout? The fallout from bombs would be different than a reactor I assume, but this is what chernobyl did:
So we're talking about billions of birth defects, radiation sickness, incalcuable environmental damage (this is across asia in general), 24+ million plus dead, all because you were tired of watching two countries bicker.