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Consider that they may be being asked to do so as part of their job. Frequently in the past UFO hysteria was encouraged by the government to cover up their own advanced technology testing, or that of an adversary they are trying to catch up to. This could also be a limited hangout, wherein the material that would be released to the public could be an unknown to the public alloy but not enough to reveal the technology that's being worked on in secret by the government: https://en.wikipedia.org/wiki/Limited_hangout