I read several similar stories in Western magazines 44 years ago. One even said the Earp clan often robbed stage coaches in the area.
I’ve decided that the most accurate history is the history that is largely forgotten or ignored. Guys like Wyatt Earp and George Custer were celebrities and stories were written about them with every conceivable slant. It makes the actual history harder to find.
If you look at something like the River Raisin massacre you don’t find the same ambiguity. The story is pretty much the same from both sides.