But Hanson doesn't say "Why don't the study's authors discuss possible explanations for this finding, such as xxx?" Instead, he insinuates that the authors were perfectly aware of this possible explanation, but think that their readers should not be exposed to it for some nefarious reasons (that's what the phrase "why doesn't X want us to hear Y" means colloquially). This sentence leads me to believe that Hanson is coming to this discussion with some biases of his own.

Anyway, other explanations could be that the result is not real (which Hanson does discuss at the end), or that women from these colleges choose lesser-paying careers for some reason other than that they are married to rich men ... perhaps women at elite colleges 25 years ago were unusually interested in charity work. I don't think Hanson's proposed explanation is necessarily wrong, but that phrase "why don't they want us to hear about this?" really rubs me the wrong way.