Dawes is not a reliable researcher; I have very little confidence in his studies. Check it.

(ETA: I also have other reasons to mistrust Dawes, but shouldn't go into those here. In general you just shouldn't trust heuristics and biases results any more than you should trust parapsychology results. (Actually, parapsychology results tend to be significantly better supported.) Almost all psychology is diseased science; the hypotheses are often interesting, the statistical evidence given for them is often anti-informative.)