I think that as a whole mankind wants to believe they are correct. I know that if I get an idea in my head I am the type of person that will defend my reasoning to the ground. It's a double edged sword though. Sometimes you really are correct, sometimes you aren't. Some people are poo faces about it while others are more polite. I believe that it stems from the good old days when science was fresh and new. As time went on everyone saw what recognition these great thinkers got and envied them. Everyone wants to be the person that knows the answer to things they are passionate about. It is inevitable that at some point you will be that person that has the answer. . . or not.
Im glad theres always someone who knows the answer, just wish they could answer my questions every now and again, for my part, i always give wishy washy annswers unless im a 100% sure, where ill say,"ill bet my life on it"
Otherwise, yeah wishy washy at best