Well... you could start by proving that the evidence of their existence is faked... as in prove the pictures are from a source other than a live server... certainly, if you are claiming they dont exist you have to resolve that fact first. Then you probably could provide something from a Blizzard employee saying that they dont drop... I'd accept that as proof they dont exist.
---------- Post added 2013-02-07 at 12:05 PM ----------
Actually I'd have to say you are blind as a bat... because in one of them you can clearly see someone riding one with a bow on their back... hence I suspect its a hunter... and given the build of the character I'd say its a male orc... but... again... prove they dont exist...