I can't tell if you're insinuating that India split the country...yes, once the War started, India did help Bangladesh gain independence. Prior to that however, it was the West Pakistani's who were responsible for incredible atrocities against the Bengali people living in (now) Bangladesh[0].
Well, it was an admittedly lame joke about how the biggest division between Pakistan and Bangladesh is literally India.
Had India not been separating the two, it would have been much easier for West Pakistan to use repression or other means to hold down Bangladesh as long as they'd like.
[0]: https://en.wikipedia.org/wiki/Archer_Blood#The_Blood_telegra...