“Like with Bigfoot, ubiquitous high-quality cameras have not resulted in an avalanche of high-quality definitive photos, but more of the same blurry snapshots.”
You might not be aware of it, but during the past two decades the U.S. and other militaries have captured the highest-quality optical and infrared imagery (still and video) you could imagine, along with other sensing modalities using classified advanced sensors from ground, air, space, and underwater. The recordings of these sensor systems are by definition classified, and would not routinely be released even if the subjects were non-controversial.
I, too, believe in the basically preternatural origin of these sightings but technology has enabled capture of all kinds of data recently; the era of blurry snapshots is long past.
My knowledge of these things is both direct and indirect. Discussion on military-oriented forums over the years has been one of the best sources of indirect information, with an amazing number of comments stopping just short of revealing classified techniques and data, but collectively enabling a keen reader to fill in between the lines. Actually leaked footage (such as the 2004 USS Nimitz ‘Tic Tac’ video) confirm earlier rumors.
Not necessarily related, but a college friend of mine had a well-connected father who was close to a fellow who worked in intelligence in the ‘50s. He said that speculation on UFOs was encouraged as a cover for US military testing. That might be why so many of these things are sighted in the US Mountain Time Zone.
Besides military cameras, there are consumer/corporate cameras covering much of the earth. The only alien-type behavior passed on by these are mainly the exploits of Florida Man.