Well, I think a thorough analysis of movies would show that Jesse James mythology was by itself a large portion of the Western outlaw trope, and lots of the others just Jesse James with the names changed.
And I think that Jesse James was possibly the earliest outlaw promoted by the press (for racist reasons,) and set the template for the pulps. Dick Turpin's ride just didn't resonate here, I think.
But this is a bbs, not a scholarly journal. Just think about it.