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.
If you are a photographer, I am bound to defer to your knowledge, but I still don't have much doubt that if a light generates sufficent brightness, or is distant enough, its edges will appear to blur.