JakeO, if you are referring to the Gainsville, TX lynchings in 1862 to the U.S. government's sanctioned lynching of Captain Wirz, that is quite a stretch (pardon the pun). The bogus trial and hangings in Texas was about Unionists (who were rightfully suspected of treason) who coincidently happened to be opposed the Conscription Act of 1862. Other than being traitors who had no intention of defending their state from invasion of a foreign army, they actually had some legitimate complaints about the unfairness of exemptions to the Conscription. Nevertheless, the mass hangings were murder.
The lynching of Captain Wirz was purely political and he was offered a reprieve if he would have cooperated in setting up General Lee, President Davis and other Confederate leaders. The facts of Andersonville have been thoroughly explored. Wirz was a political scapegoat who had no power or resources to feed and provide medical care for the prisoners (or guards) at Andersonville. Yet, during the War, the Lincoln regime purposely withheld vegetables, fruit, blankets, clothing and medical supplies so that killing fields such as Elmira and Douglass rivaled Andersonville. Lincoln could have accepted President Davis's unconditional offer to accept thousands of Union prisoners in 1864 or 1865 and he could have agreed to send them food and medicine, but he chose to let them suffer and die. They were good fodder for his political propaganda. Class act.
Confederate authorities tried to obtain medical supplies for the Union prisoners at Andersonville, but Lincoln refused to sell them, even though the Confederates offered to allow Union doctors to accompany the supplies to ensure they were used for Union prisoners. After the war, even some Union officers placed the blame for Andersonville squarely on Lincoln and on Ulysses S. Grant, not on the Confederacy.