Anders_H, you are much more patient than I am!

(re: last sentence, also have to assume no direct effect of instrument, but I am sure you knew that, just emphasizing the confounding assumption since discussion is about confounding).

Grand parent's attitude is precisely what is wrong with LW culture's complete and utter lack of epistemic/social humility (which I think they inherited from Yudkowsky and his planet-sized ego). Him telling you of all people that you are using a weird definition of confounding is incredibly amusing.