You're in such a strong position when you understand the scientific process because all you say is, "Do you understand that the great breakthrough of humanity was figuring out how to make decisions about things whilst discarding human foibles? So, anecdotal evidence involves all your subjectivity—if we do it like this we don't have that anymore. Why, surely do you understand how "powerful" that is?" And if they don't, then that's what you have to explain to them. It's an extremely powerful thing and a very basic thing.