While I understand the root of your position (Tulsa World = lib, DOK = extreme conservative), this seems more accurate historically than it is currently. I have noted considerable liberalizing since Christy took over after the passing of her father, including on the editorial page.
I think the reason they don't pursue this is journalistic laziness and conservatism in the sense of seeking to maintain the status quo. In addition, they don't want to be seen as the latest iteration of the "grassy knoll" group, at least in their own mind.
Agreed.