They study, they tell us what they find, they study more, and tell us new information, and keep going, getting better and more refined as they progress. More researchers test the claims, and prove it one way or another. If this isn't good enough for you, then at what point would information ever be good enough for you? Do you expect a time when knowledge is complete and set?

You prefer the ideas of non researchers, people with no foundation in the subject or scientific methods? You prefer their advice? You might as well take your scientific facts from a bloke in a bar.