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Project Mogul started the ball rolling? That is pure speculation. I have seen period photos showing the alleged debris. In June 1947, some reporter informed the public about "flying saucers."
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It is not speculation at all. The number of UFO reports, military and civilian, US and worldwide, rise when the large-scale balloon recce program begins and fall when it ends. That is a fact that one can independently check with a minimum of research. So there is undeniably a correlation between the two phenomena. How one chooses to interpret the correlation is, of course, up the individual. But the simplest and thus most logical conclusion would be that there is a causal relationship between the two phenomena.
The thing that crashed at Roswell was an Army Air Force balloon that, according to what I have read, carried a sonar-like acoustic detector designed to remotely detect and locate atmospheric nuclear tests in denied territory (something that never worked). The balloon went off course immediately after launch, headed off drifting cross-country at low altitude, and eventually ended up on the ground, at which point the wind started ripping up the balloon. By the time locals saw it, it had been shredded and had developed the silvery, greenish-grey that every former construction laborer recognizes as weathered, wind-blown polyethylene sheet. But in 1948 few had seen weathered plastic sheeting. Then, when the government reacted with the usual, heavy handed over-reaction typical of military "security" operations, flooding the area with MPs and claiming that a familiar, much smaller, and decidedly non-secret weather balloon had crashed, it was inevitable that at least some people would believe something that they'd seen--or more often heard of--must be "alien skin" or a crashed UFO .
Now, one is of course free to believe that the above explanation is a carefully concocted cover story designed to cover for the pathetically flimsy weather-balloon cover story and released to the public more than 50 years later (for some reason). One might even choose to suspect that I am a Man in Black who only joined this forum however many years ago it was in order to shut down any discussion of Roswell.
But I think a simpler explanation is more likely:
[1] The security people in charge at Roswell were flustered, authoritarian by nature, and probably not very bright (fairly typical of security in my experience).
[2] These security people created publicity when they should have maintained secrecy. The thing became a circus.
[3] So, per the core principle of national security (nothing embarrassing must ever come out), the soon to be independent USAF decided to shut its collective mouth and keep it shut.
[4] Eventually time passed, the original participants died or retired, and the Air Force had enough subsequent embarrassments on its plate that the bureaucracy decided to clear said plate of the Roswell fiasco, empty the filing cabinets, and focus on other problems.
In short, I suspect SNAFU, not UFO.