Hickok and Holliday were not outlaws
I saw this film today and really enjoyed it. A few brief points -
1) It never actually says he is in the film, but some people reviewing the movie are counting Wild Bill Hickok as an outlaw. He wasn't an outlaw - in fact he was on the side of the law, he served as both a US Marshall and a sheriff. He did do a number of, let's say questionable things to possibly merit a spell in purgatory.
2) Doc Holliday was a dentist, not the MD he is seen as here. Doc wasn't really an "outlaw" either, but a travelling dentist and gambler, though his tendency to have an explosive temper and become violent got him into trouble with the law a number of times.He was chronically sick most of his adult life and took to the bottle for escape/medicine - which may well explain his bad disposition. Purgatory was fair enough for Doc, I guess. One of the outlaws says Hickok had been dead "10 years"; Bill died in 1876, making the events in "Refuge" taking place in 1886 - but Holliday was still alive "for real" in 1886, he died the following year from tuberculosis.
3) Billy the Kid - most of his crimes were against the assassins and their minions who had murdered his mentor; there were also 2 killings during his jailbreak after he was betrayed by the authorities over an amnesty and was waiting to be hanged. Billy might have merited a second chance( but I doubt Jesse James would have).
4)I think it's unlikely that you could "recognize" the real people from the sort of inaccurate illustrations seen in in nineteenth century dime novels. I very much doubt there would have been a dime novel about a celebrated harlot "with a heart of gold" in the 1880s, certainly not one which used "harlot" in its title.