Nick Redfern explains his perspective on UFO crashes and cryptozoology in a brief but revealing interview here. Nick's uniquely skeptical approach to all things Fortean has resulted in a healthily iconoclastic disdain for typical, belief-driven approaches to the paranormal. For example, Redfern embraces the Roswell controversy while insisting -- and not without evidence -- that the infamous event had nothing whatsoever to do with crashed alien hardware.
Like Nick, I'm convinced that ufological discourse will remain mired in its present state of uncritical acceptance until we dispense with the unspoken need for cosmic company. (Which isn't, of course, to preclude the possibility that some UFO events indeed represent the machinations of extraterrestrials.)