I don't know, maybe the fact that Pakistan since independence has attacked us 4 times trying to capture territory, and specifically Kashmir ?
An average Pakistani hates India, and Hindus. They wish destruction upon us. Pakistan has focused on building military capability over economic development since Independence, while we focused on economic prosperity, with military always an defensive arm. In essence, Pakistan is betting on the fact that all their investment in military will be justified sooner and later. Attacking them and justifying the "Evil Yindoo Baniya" theory will give them enormous validation and pleasure.
See how many players currently win from India attacking Pakistan -
- China, because it relieves them pressure from northern borders. Maybe China would use this opportunity to attack Taiwan, or just grab some more territory from us.
- USA, because they can sell more arms & ammo to both us and Pakistan. Also this will allow them to declare India (and Modi Govt.) a fascist state and corner us/cut-us to size in some way.
- Pakistan (Govt, Military, State), because their gawar junta & mullahs will forget about all the corruption, economic condition and differences to focus on defeating India, a great energizer to their country & economy.
- Indian Opposition, because we will probably fail just as spectacularly in narrative & psywar as in Balakot and nothing will be more pleasing to the opposition.