BD allows them to stay till they can go back to their homeland in dignity and safety. If they cannot ever go back then that can be dealt with in the future.
In the meantime they are allowed to work like anyone else to make a living if their studies are over. BD must take care of these people who given opportunity can contribute to BD. If BD can spend hundreds of millions of dollars looking after Rohingya, it can spend a few million looking after the Kashmiri students.
Last thing on the minds of the helpless Kashmiri students is marrying a local.
Like Rohingya, fate has dealt the Kashmiris a terrible hand.