Jesse only killed who needed killin'.
Yea, those many Union soldiers who surrendered to his force and laid down there rifles, only to be lined up and shot in the back, Yea... ... they had it coming.
Oh yes, and all those train conductors, bank tellers and guards, of course they where a menace to society and had to be put down.
The man was a thief and a cowardly murderer, I don't care what perceived injustice he suffered, or how rough his childhood was, there can be no excuse for his crimes. It sickens me that some people today seem to idolize him as a hero, and not the evil murdering SOB that he truly was.
And yes, it seems pretty black and white to me that James was killed by Ford, and that Billy was killed by Pat Garret. The one old west mystery that is a lot more grey is this;
Was Butch Cassidy killed in Bolivia by the Army as Pinkertons claim, or did he escape and return to his ranch in Utah as many of his descendants claim?