There used to be thousands of UFO sightings every year. Now with the arrival of smartphones and ubiquitous cameras, there are almost none. Which indicates that

There used to be thousands of UFO sightings every year. Now with the arrival of smartphones and ubiquitous cameras, there are almost none. Which indicates that the UFOs are an intelligent civilization that is adapting to observe us in secret. Whenever we develop means of tracking them, they hide better.