Opinion on why UFO's are not real?

I am not trying to say that UFO do not exist but i believe the sightings are not. We are at a point technology wise to we are the beginning of cloak devices. By the time humans can make such aircraft's, we would have perfected cloaking. UFO's are too advanced for their it to be light shown. A society that can make a UFO probably be able to solve all problems we humans have