Exactly. It just didn’t happen if there wasn’t a photo taken of it
Such a simplistic position to take.
I might have a Leica-lensed camera in my pocket today, you might have one with a Zeiss, Sony or Hasselblad lens in your pocket, always on you. Wasn't always the case. There was a time when you had to make a positive decision to carry a camera. Not many folk carried an SLR or even an Olympus XA or a Rollei 35 on a day-to-day basis like we carry camera phones today. I didn't and I'd class myself as a keen photographer.
As I think one of the denizens of this very forum has pointed out, since the advent of the camera phone there's not been many UFO sightings.
Chris