But there's a side aspect of this dynamic where, in order to make your immediate theories seem more convincing to people in those early times, you have to be completely emphatic in your certainty. People are looking for answers, and you seem like a bad source of answers if you present your theories as possibilities that you can't prove. You have to push them as if you have a rock-solid case, or else you run into the risk of your audience searching for someone else to give them the impression of that certainty that they need in order to comfort them.