As with Carl Menger’s son (Karl Menger), Ludwig von Mises brother was a Vienna Circle positivist who stood somewhat in opposition to his kin.
Here are two interesting articles - the 1st by Richard von Mises, the second about. I do pretty much agree with the last paragraph in the second article - at least in regards as to that being what actual factual serious and relevant scholars look at (even though I technically ddisagree with these moral /social theories as a whole).
http://www.depressedmetabolism.com/richard-von-mises-positivism-a-summary/
http://againstpolitics.com/2011/10/19/richard-von-mises-positivism/
If you are talking/debating against any other form of science, social outlook, or ethic, you are simply wasting your time on irrelevant people and ideas.
Though I really on’t think the gulf is as big as it seems, it is interesting to note. And I think we are way closer to these guys, kenesians, and whatever other bourgoise professional left of center group you can name, than with actual factual leftists, conservatives, or any other political / scientific group out there.
Not to get too into it, but - I see it as a battle of two different but similar types of “empiricisms”,“liberalisms”, and “consequentialisms”. We are simply trying to make corrections on an already “correct” and functioning worldview. That may sound confusing, but oh well, as I’m too lazy to think or speak about it right now.