About the term Bihari, here is a quote from a Bihari herself,
"Bihari was a loose term used for people who came from Uttar Pradesh, Poona, Maharshtra, for Punjabis, Pathans. Every non-Bengali was a Bihari.”
Almost all of them came from Bihar:
http://www.tandfonline.com/doi/abs/10.1080/02666958708716034?journalCode=cjmm19
The rest of the migrants were primarily from West Bengal. Though some came from Assam and Orissa as well.
the point is what has Pakistan done for the people who fought for them and risked everything.
That is a bit of an exaggeration. Most of the Biharis did not take up arms and fight, only some did. Some Bengalis did too.
More importantly, the vast majority of the Biharis still living in these camps were born in Bangladesh, not East Pakistan:
"About 80 percent of the Biharis were born in Bangladesh and consider themselves Bangladeshis, like Muhammad Nadim, who was born in Dhaka two years before the war. 'We were Muslims and left India to come to another Muslim country. But that India is not ours anymore. Pakistan is also not ours. Bangladesh is ours but we have no rights here. The Red Cross has been taking care of us for so long.'"
http://www.dw.com/en/bihari-migrants-wish-for-better-life-in-bangladesh/a-6554559
Biharis who were minors at the time of the 1971 war have been granted citizenship as well.
The bottom line is that most of these Bihari people consider themselves Bangladeshi, not Pakistani:
http://www.scientificjournals.org/journals2008/articles/1313.pdf
This particular poll was taken all the way back in 1993. And it includes Biharis of all ages (including the older ones not eligible for citizenship). The demographics have since changed in these camps. Nearly all of the younger Biharis, born in Bangladesh (not East Pakistan), consider themselves Bangladeshi and have no interest in being "repatriated" to Pakistan.
I can only imagine how lopsided a survey taken in these camps today would look like. If these people were given a choice between Pakistani citizenship and Bangladeshi citizenship, few would choose to go to the foreign Pakistan.
You guys had no problem to bring back the 93000 and i am sure none of them spent their own money to return back....it should not have been a problem for Pakistan to take biharis to Pakistan at that time
Pakistan has already accepted more than 170,000 Biharis from Bangladesh. Who knows how many more have immigrated illegally.
http://www.scientificjournals.org/journals2008/articles/1313.pdf
but i guess there was no will for that from Pakistan.
During the 1980s and early 1990s,
Bengali Bangladeshis illegally immigrated to Pakistan for economic reasons. There are far more of them in Pakistan than there are Biharis in Bangladesh. Between 2-3 million of them are currently residing illegally in Pakistan:
"The illegal immigrants, around two million Bangladeshis, 2.5 million Afghanis and 0.5 million other nationals including Africans, Iranians, Iraqis and Myanmars, are currently living in Quetta, Peshawar, Lahore, Islamabad, Rawalpindi and other cities, an official said on Monday."
http://tribune.com.pk/story/322325/five-million-illegal-immigrants-residing-in-pakistan/
Pakistan has since tried to deport some of these illegal immigrants, but Bangladesh refuses to take them back.
Why should Pakistan take any of the few Biharis of Bangladesh who still clamor for Pakistan, if Bangladesh is unwilling to do the same with its citizens residing illegally in Pakistan? I guess there is no will for that from Bangladesh.