[superuser2]

Therein lies the problem. On many of the questions that psychology studies, people are deeply committed to an intuitive answer.

A layperson reading any psychology experiment will either say "That's obvious! You spent how much establishing something everyone already knows?" or "No way. You must be twisting the data to make a name for yourself." Particularly when it touches hot-button issues like "to what extent are [people I don't like] in control of their own situations?"

You don't get that around physics quite so much.