This question is almost blasphemy to the Pakistanis. India diverted 10 division of troops out of 25 division for the liberation of East Pakistan.In the western sector,Pakistan had numerical superiority in both men and materials.Anyone would expect them to overrun the Indian position in the west and capture at least Kashmir which they covet so much.They got an golden opportunity when India diverted much of it's men and materials in the east.But those ''most handsome and martial race soldier'' in the western sector repeated the same pathetic cowardice like their brethren in the East.Rather than capturing Indian land, they lost 15,000 sq. km land in west Pakistan,their Karachi port was left in ruins and India altered LOC in Kashmir at easy.
Later in Simla agreement they got back 90,000 PoW and most of the land by begging to India, but India retained around 1100 sq. km strategically important height,pass in Kashmir LoC.Pakistan was forced to acknowledge the Kashmir dispute as the bilateral one thus permanently damaging their position on Kashmir issue.Not to mention the outcome of the east when coward Niazi surrendered without any whimper and 55 percent people of the Pakistan said goodbye to the Iqbal,Jinnah's Pakistan forever.Is there anything bigger disaster and humiliation, a nation can undergo at the hands of supposedly 'arch enemy' than this? I would say,this was the poetic justice served by the almighty for their racism,hatred,exploitation and genocide against innocent Bengali people for long 24 years.