That's the whole point of 2.5 front war,
Our neighbors would have a tremendous advantage if they can open a front within the country
This is the core idea behind 5th generation warfare, shift the loyalties of your own people elsewhere
They are/were never loyal to the "country", only to their religion.
It is the reason why they disassociate from their Indianness by saying muh ancestorz wuz Arab, Persian ,Turk, Mongol, Pathan.
Why they say Muslims speak a different language called Urdu( boomer excuse from independence era, but it was a product of the same mindset ).
It is also the reason why they oppose saying Vande Mataram and singing Jana Gana Mana.
This is seen as a Dar-ul-Harb that isn't converted yet, so they refuse to except that they are a part of a Kuffar nation.
This is the crux of the problem.
The ones here probably will get fucked here though if they try the stuff Arabs are doing in places like Lod in Israel.
And that is excluding the possibility of intelligence agencies nipping such problems in the bud.