Well, I can see why you didn't put the link down for that squib on Forrest. It's here:
http://thumpandwhip.com/2010/08/16/rightwingnews-com-deletes-their-worst-americans-list/
When you put up a credible historian or scholar instead of a skewed blog, I'll be most happy to listen!
Let's look at those 'victims' a little closer. (This is informal, as I'm away from my resources and there's not much online, but it is reasonably accurate.)
20 is not the total. Closer to 40.
Battles:
Sacramento: 3 sabered, 2 shot. Forrest crashed his horse into a Union cavalryman's horse in an attempt to save one of his lieutenants and was dismounted. He was promptly surrounded, on foot and had dislocated his right shoulder in the fall from his horse.
Fallen Timbers: Led a charge into Sherman's second tier of infantry but nobody followed! Surrounded by literally hundreds of enemy soldiers, he shot 6 and escaped with a severe wound.
Okolona: 3 sabered, 2 shot. This was a long running battle and the only time Forrest did something rash, which was charge a line of several hundred Union troopers with about 50 of his escort - his beloved brother had been killed and died in his arms.
Murfreesborough 1 - 2 shot in street combat. 1 possibly shot afterwards either by Forrest or on his orders. This man was pointed out by two prisoners in the Murfreesborough jail as the person who set the jail on fire in an attempt to burn them alive.
Memphis raid: 1 sabered, 2 shot in street combat.
Chickamauga: 1 shot. A sniper in a tree making good count on his men. He took a rifle from someone and shot the man.
Selma: 6 shot, 1 sabered. Forrest was pinned against a wagon train and surrounded by Union cavalrymen determined to be the one to kill the famous rebel general.
Retreat from Selma: 1 shot. A young sniper pinning his men down - they were taking casualties and the boy wouldn't cease fire.
Pre-War:
Shoot out in Hernando: 2 shot, 2 stabbed - 1 survivor. Three Matlock brothers and a relative named Bean decided to shoot it out with Jonathan Forrest, Forrest's uncle. They killed the unarmed old man, Forrest killed one of them and wounded the others, two of whom died later. He was arrested along with the survivors but promptly released and not charged as dozens of witnesses stood by him. Self-defense. (The survivor later rode with Forrest in the war.)
Post-War:
Woods affair: 1 axed. A man named Woods, who was a former slave of Forrest's and had served with him throughout the war, was beating his wife with intent to kill her - other blacks couldn't stop him and fetched Forrest to help. The man pulled a knife on the general and was killed with an axe blow to the head. Forrest was arrested and charged with murder but acquitted in the following trial. He was the first white man in Tennessee to be tried for the murder of a black man, and the first person of any color to be exonerated by black testimony. The man's teenage niece was present, and was being protected from attack by her uncle by Forrest - which is how he came to kill the man.
Miscellaneous:
1 color-bearer (possibly 2) for cowardice, 5 deserters for running in the face of battle, 1 personal attack, which would be the Gould Affair - Gould shot him, after all.
There you go. Now you don't have to 'bet'. Do you see anybody in there who was murdered in cold blood, for no reason?