I think you should use anecdotal evidence
I think it's actually dangerous for a society to completely dismiss anecdotal evidence from their decisions. This makes it very easy to control a population. Everyone wants a study now to prove a fact. I was talking to someone the other day who claims there is no behavioral differences between boys and girls before puberty. This is something that if you have spent time around kids you would know isnt true. Boys are often rowdy and play with different toys. This is noticeable even before the child is old enough to understand gender roles. He told me this is anecdotal evidence and he completely discounted it. So all you need to do to convince this person is get a professor from yale or harvard to write him a note. I wonder if the note said the sky was green if he would believe it.