I'm not the expert, but I don't think a camera can see clearly defined hard edges on extremely bright lights. Same goes for the human eye, I believe. Atmospheric effects over distance also tend to make things fuzzy.
Well I have been an amateur photographer for many years and you are just wrong. The above is an out-of-focus photo of some streetlights that I just took and you can see "hard edges" on the bright street lights just like in the purported UFO photos.