I don't believe I discussed radar issues?
Now were on a subject with which I have some expertise, having worked as a free lance professional photographer for much of my life, on the issue of photography.
1. Before cell phones with cameras, few people carried point and shoot cameras around with them as they do now with the advent of the cell phone, let alone pro or semi pro gear.
2. Fewer still, would be someone carrying gear capable of professional caliber photography, particularly given that to do the job right, you would need two cameras, one with a telephoto range of say, 100-500mm, and another at 600mm, maybe 800mm, and such lenses are too costly for average folks, even to rent because one would have to spend weeks waiting for a potential shot.
3 It appears to be true that most of the sightings are at night, thus the greater odds of getting a shot are in low light, and before the advent of High ISO speed digital gear, film of the film era were limited to 1600 and 3200 speed film (black and white for outdoors, color film at these speeds was white balanced for tungsten lighting), which were grainy has all heck, nice for black and white art shots, but terrible for forensic shots, requiring slow shutter speeds which in turn require a professional and expensive tripod, such as a Manfrotto
Since the introduction of High ISO digital cameras, including higher ISO cell phones, night shooting is better than it used to be, but cell phones really aren't designed for sports photography, the kind of rig one would use for sports would be similar for using or shooting UFOs. Fast FPS, accurate center weighted metering. telephotos with the focal lengths one would use for shooting birds, 200-500mm in my estimation. On top of that, I'd want another camera fit with an 600mm maybe 800mm lens, fixed focal length. Could use a crop factor body, such as the Canon 7d, to extend the reach (but with 50megabyte sensors, the crop factor sensors are obsolete now unless you are shooting with an older, smaller res camera). Such lenses can easily exceed $10k. At night, a cell phone's shutter is going to drop below the user's steady hand holding capability, and the shots are going to be blurry. This would be much less of a problem with a pro rig on a steady tripod.
Very few people have the kind of rig necessary to get such shots, that greatly narrows the field of opportunity for good shots.
Still, I watched a video of a guy who had quite the set up, several video cameras, several DSLRs with different focal lengths, and he got a lot of shots, but he still was unable to get a close up, a well defined shot.
The answer to this dilemma can be garnered from the abductees, who explain their own plight in trying to photograph aliens with video cameras installed in their bedroom so they thought they could capture them in the act of being abducted. No such luck, as I will explain, below.
Now, of course, you are going to have to suspend disbelief if you want to follow the logic I'm about to present, and even if you don't believe it, it IS a valid point IF it were true. And it goes like this:
Aliens know all about us, They know all of our languages, they know a lot about our culture and technologies. They have been studying us for thousands of years, if not longer. And they know where our cameras are, and can disable them from a distance. As far as the distance goes, if you are within the range of a light beam, so to speak, they can disable any electronic device. And they do, when abducting humans because they are operating clandestinely. They intentionally prevent us from garnering hard evidence. At a greater distance, they are not able to shut off electronic devices, and that is why all we have are at a distance shots, which , even with pro cameras, they are not very satisfying.
This is the point, when you, folks in general, and when such learned men as Neil deGrasse Tyson, when he often complains with, 'for a couple of decades now, there are billions of cellphones about, all with cameras, and how come there isn't even one solid, up close, clear shot? It defies logic" he says. That logic makes sense, until you understand the aforementioned factor.
And, of course, the operative phrase is, and is always: 'Believe It or Not!".
To learn more about this, I do recommend you read Dr. David Jacob's 'Walking Among Us' (and his other book "The Threat") and once through with those, books by Budd Hopkins (famous artist, and abduction hypnotherapist who taught Jacobs) and Dr. John Mack, the famous Harvard fellow psychiatrist, on this subject of abductions.
See above.
And since I own the right type of gear for this type of shooting, I'm thinking of making a trip out to the desert, some time, or perhaps near a field of nuke silos, where they are often seen hovering. However, that might strike the ire of the military, so, maybe not

What I plan to do is bring a totally mechanical rig, no batteries or electronics, so the aliens can't disable the camera, and use high speed film. Since most photographers are not aware of the alien agenda, their electronic disabling capability, few have thought of this.