Presented on another and similar topic thread, which I may post title/link to later;
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Short of the long is that many to most Guv'mints would not use it to stir up fear and enhance power since the most obvious implication is how they are powerless to impede or prevent such blatant violations of their sovereign airspace. Confusion and disinformation better serves their purpose of not admitting they are powerless and also keep the public baffled and confused.
Also, not any "govt' would do as you suggest. Some might, others wouldn't, and it appears that for now, most have a "No meaningful comment" stance.
Much of the above stems from a few aspects you seem not to have grasped. You are not alone there since the vast majority of humans are in the same boat.
Let's take a moment to examine some of the basic concepts and issues here.
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Many of these sightings/encounters display "something" in the air/atmosphere that show ability to move and maneuver in ways our current aircraft technology can not do. Since the first reported sighting of the modern, post WWII era; Keneth Arnold, from about 76 years ago ~summer of 1947 ~ one problem/challenge has been how to label or describe what "these" are.
Initially the Press/MSM latched onto a term "flying saucers" but within a few years it was clear that was not accurate descriptive. So next label was UFO =Unidentified Flying Object. However that term implies a physical device or similar and some of the reported sightings appeared to possibly be more phenomena than object. Hence in recent years there has been adopted the term UAP = Unexplained Aerial Phenomena. For now the seemingly best and most accurate and inclusive term to apply.
So starting from the above point of reference what are some of the characteristics of UAPs that are of concern and suggest they may be "not of this Earth" (or of science we don't know about yet).
A] Many sightings report they were able to move at speeds several times that of sound, thousands of miles per hour, and then come to a sudden stop, and often hover there. OR, just the opposite, go from a 'dead stop' to "instant acceleration to several times the speed of sound or thousands of miles per hour. Either example are beyond the technologies we humans have at present. Also wound result in G forces that could be fatal to occupants.
B] They often appear to be able to do right angle turns; left/right or up/down. This is not consistent with our knowledge of science, especially physics or applications involving lift via aerodynamic surfaces and conventional prop or jet propulsion. Again, there are implied G forces that could be harmful or fatal to biological occupants.
C] There are reports of sudden appearance and/or sudden disappearance of these "objects". This could be a matter of perspective related to their sudden accelerate/decelerate from/to STOP. Or it might suggest there are one or more physical dimensions beyond the three that we know of, experience, and operate within.
D] The above, if being done by physical objects~devices strongly suggest science knowledge and related technology applications beyond what we Humans can do here on Earth. i.e. "Not of this Earth" technologies and performances.
E] Along with possible additional dimensions; 4th ~ 5th ~? beyond our 3D that are being used/manipulated; these might also suggest some form of anti-gravity propulsion systems.
F] If anti-gravity physics/systems are involved, then we could be seeing something that is equal to or greater than atomic/nuclear physics in terms of power and destructive potentials. Hardly something for "children" races/species to be playing with.
In addition to the science/physics+ and technologies being evidenced, there are a couple more aspects~concerns to factor in;
G] If their are biological entities inside and operating these 'objects'/devices do they have similar or divergent biologies compared to those here on Earth? Could those divergent biologies be hazardous to Earthly biology.
H] based on the variety of descriptions on 'craft' appearances and performances, along with the reports of encounters with various types of occupants of such 'craft' we may not be dealing with a single species/entity type/agency( ET "government"). We most likely are dealing with several types of beings, from several types of social/government structures, with several varied Agendas; some of which may not be compatible with others.
I] Now add in that we mostly know only what has been made public here in the USA/West. What is known about UAPs in other more closed nations like Russia or CCP China also remains about as unknown as the many details we do know of the UAPs.
So to anyone with some experience/knowledge/grasp of what is known as military and government intelligence operations and agencies, part of the problem these past 75+ years has been: "How much do "They" (commies) know that we don't? Or visa-versa?" "What do we give away to them by revealing the full extent of what we known?"
Point is , if you go through and fully, properly digest what I've presented above, plus the nuances and "between the lines" implications, you will see that there is too much at risk still for our governments and or their governments to fully reveal what "we" know. And this is aside from factor that We or They may have "made deals with" one or more of the factions within those ETs.
And this is all going on current knowledge, experience, and encounters/sightings. Going through earliest written records from the first civilizations provide "HINTS" that the ET-They may have been around and active here for centuries or even millennia. If so, how much have "They" influenced our(Human) development and current states of affairs?
Aside from shaking foundations of most of our Religions, this could also greatly alter our History and concepts of who and why we are.
This is a bigger "Pandora's Box" than most "average" people realize or have considered.