Which is worse. Within India, they would have been under better control.
Perhaps. But having the festering sores as outsiders — “them” — can offer a unifying theme within (at least for those who identify more closely with the national identity than with the outsiders).
Or India could be subject to even more islamofascist attacks, and have a Muslim minority trying to impose Sharia law in at least some states if not the entire country. (only around 3-5% of India is Muslim today; with Pakistan and Bangladesh’s populations added in, the percentage would be even higher (still less than 10%—the estimate for France—but still larger).