I believe that a traitor is a traitor, and should be treated acordingly. In the North, Valdingham was a traitor to his home, etc. and could have been punished accordingly.
By the same standard, Unionist in the South, should have been and in many cases were as well.
Both sides sometimes had to play rough, but I feel that the Confederates shed much more blood of its own people than the Union did. Part of this was undoubtedly due to the fact the reb areas contained almost all the armed conflict, but I think that the nature of the CSA lent itself to the prominence of a class of stay at home parasites who enriched themselves while better men put their lives on the line in fair combat.
Is a man a traitor who remains loyal to his first cause when those around him switch theirs? Is he a traitor to his honor, or to the herd?