I have read many UFO books on the subject and there is one major complaint on some of those books. You have written them for your base of people who believe we are being visited. This presents a large problem as you are preaching to the choir as they say.
I know you want to make a nice living writing these books and there is nothing wrong with that. However, when it comes to the ones who are just getting interested in the subject, these books tend to have glowing errors in them. One book I read speaks glowingly of Ed Walters and the Gulf Breeze photographs. Some serious researchers have found many flaws in that case and there has been one young man who came forward to state he helped hoax the pictures.
Did the UFO researchers look into this claim without bias to see if it was true? No, they immediately and viciously attacked the boy and called him a liar. They also claimed the model found was set up by a disinformation agent. When reading the actual way the model was found, those accusations seem quite puzzling and shine more light on ufology than the claim of the photos being hoaxed.
Yet, this case is still used to show the evidence for UFOs as possible ET craft. If one is going to believe this subject without looking into it that is fine. But there are going to be many who will find out about the problems with Ed Walters and then question other aspects of ufology and the commitment to really finding out the truth.
There are going to be many cases which will have an earthy explanation or will even be a hoax. However, there are many great unexplained cases out there which come from impeccable witnesses. I think it is the duty of the authors and researchers to start writing these books thinking their buyers are skeptics and debunkers. Challenge yourselves to find the best cases and the reasons why ufology should be taken seriously.
Otherwise, it will remain the laughing stock it is in the scientific community and rightly so.