Think of it this way Llawgoch, if you by any chance are a poker player, you'll get this. DWA is saying, "I have three of a kind." (Or, to state it in terms you might agree with more, "I have an Ace high") Your saying, "No, you don't" won't even call his hand, let alone take the pot. He is asking for you to show your cards. You hold no cards is all we can assume.
You say folks are copying one another in their sighting reports? Give us an example of where/how/when this has ever happened. Failing to do that = no cards.
With the criteria you are advocating, you would be free to theorize anything you want to propose, limited only by your imagination. The "BF Doesn't Exist" lenses make it very, very hard to get any inkling of theoretical truth from sighting reports. You could even go so far as to shut yourself off from even reading them. Umm....am I to guess you don't, you know, actually read them? Well, there you go.
And too, I've never heard DWA state you or anyone else should accept the existence of BF. He is saying, as I have said many times, the evidence points to more probable than not and should be pursued. It is the whole "pursuit" thing we don't ever get much help on from the skoftics. To give the evidence no value, as you apparently do, is, no matter how many times I encounter it, genuinely remarkable.
I have to say, you obviously are much more sophisticated in your approach to discerning the credibility of others than I am. You'd think after questioning people under oath for 35 years I'd know better. Some people, huh? Yep, that's me all over, Mr. Gullible! Whatever you do though, don't tell the wife, she's already threatened to not let me out of the house without supervision.