I was reading through the Pakistan Wikipedia page which led me to the Indo-Pakistani wars and conflicts page and I notice that the U.S. not only offered military and diplomatic support during the war but they were also one of the last nations to recognize Bangladesh as a nation. Was the war more opaque morally at the time or were there alternative motives at work?
There are always "alternative motives" at work. The United States provided Pakistan with military, diplomatic, and economic support because it was America's greatest ally in the region. A pro-US military dictatorship with a staunch anti-communist stance to create a buffer between the axis of the USSR, China, and left-leaning India.