I'll have more to say later, but the first half of the article is rather less than I hoped for. It's about an obscure World War II confrontation that went terribly wrong, resulting in over 700 deaths. They didn't exactly keep it secret, but basically drew attention away from it in a way that it would be overlooked in the fog of war. If you look it up, you can find a short paragraph about it here and there, but it's the sort of battle where commanders heads could roll because of the screw-up. At the end of the day, if accused of keeping secrets, they could point to the fact that there are reports about it — thus plausible deniability. Politics you see.
Sure. But the issue isn't why it was kept secret but that it was kept secret -- that in fact it could be kept secret. We all know that the Manhatten Project was kept secret and how difficult that secrecy would be to maintain given the numbers of people involved in it at several locations over several years.
It doesn't demonstrate how we'd keep the Roswell secret — which may have involved the crash of an alien spaceship and the recovery of the craft and the occupants — which would be a development with worldwide impact. I hope you see the distinction.
I do see the distinction, and indeed the event at Roswell would have worldwide impact. But the news of it was squelched immediately and we're well aware from the witness reports and witness families' reports how those possessing information, even at second-hand, were threatened and even terrorized into silence, a silence only gradually being broken. When the subject of Roswell was reopened, the immediate response was disinformation generated by the alphabet agencies. In the meantime, decades had passed during which the physical debris at Roswell had disappeared into Wright Patterson and the Battelle Institute [and perhaps other locations] where it was analyzed and likely back-engineered for what could be learned and duplicated from the superior technology it represented. That too was kept secret until Bragalia pursued his research into the secrets and the secret-keepers. We've already recognized the motivations of government and the military for maintaining secrecy about what they learned, and indeed the motivations of what became the military-industrial complex involved in taking what has been learned about recovered 'alien' technology into deep black projects funded by US taxpayers but reporting to no one in the elected government, and also enriching the corporations involved. Politics has been involved in that too, but private economic profit and control have continued to motivate the secrecy. Read Bragalia, all five reports, and Stalton to see how, by what means, all this evolved.
With Roswell, the government could easily justify keeping a secret because of the implications to national and planetary security.
Keeping the reality behind many ufos a secret to avoid public panic and massive societal disorder is, or was, reasonable for many years. By now we effectively have a secret government controlling information that everyone on the planet has a right to know. To whom do the people involved in that secret government report? We don't know that they report to anyone in the elected representative government responsible for our welfare and, given this country's power in the world, responsible for the welfare of all human and other life on this planet. Since these people don't report, we have no idea what they are doing, what their motives are, what the future might bring from them. Demonstrating the fact of the secret-keeping is the first step in enabling the public to understand the actual conditions of our current existence and perhaps to act against this massive, decades-long manipulation.
I hope the second part is more relevant to the discussion at hand.
You will find that it takes you directly into what has been uncovered by Bragalia. Stalton's paper, approaching the secret development of shape memory metals from the perspective of the lack of public records, confirms the extent of the secrecy involved in extrapolating from what was left on the ground at Roswell.