As I stated in post #586: "Northern politicians played politics with Andersonville then just as your northern politicians play politics with Abu Gurab and Gittmo now."
Some Northerners during the WBTS figured it out. Here's Walt Whitman in a December 1864 letter to the New York Times concerning prisoner deaths at Andersonville:
In my opinion, the Secretary has taken and obstinately held a position of cold-blooded policy, (that is, he thinks it policy) in this matter, more cruel than anything done by the secessionists. ... In my opinion, the anguish and death of these ten to fifteen thousand American young men, with all the added and incalculable sorrow, long drawn out, amid families at home, rests mainly on the heads of members of our own Government..."