It is a realistic scenario.
India can think of any illogical reason to attack Pakistan and its gullible, illiterate, nationalist population with an average iq of 76 and widespread access to digital propaganda will eat it up.
For instance, the last time the reason India attacked Pakistan was because of terrorist trees (but then India clarified it meant to strike a children's school instead), and most of your countrymen still gobble that BS up and believe Balakot was some Indian victory, when even Hindutva's favourite scholar Christine "let's bomb Pakistani civilians" Fair called Indian claims "Bakwaas" in front of your top brass on live tv.
Then Indians voted Modi in en masse.
So no, I don't think we will need to spend a lot of effort searching for reasons India will have to attack Pakistan.
This is a defence forum where we discuss defence matters, and hope we never see our theories applied in reality, especially the nuclear ones.
Regardless, your Indian friends have conjured up a number of fantasies including that India can destroy Karachi and other cities with conventional weapons and Pakistan won't retaliate, a BMD at two stations which only cover Mumbai and Dehli with a sub 30% interception rate will nullify Pakistani nukes completely, or Pakistan is bluffing about nuclear weapons (an especially dangerous delusion), and so on. I'd like them to first explain themselves.