I see your point but I could also imagine reasons one might want to keep under-development super-advanced tech secretive. I could also imagine that a small group within government, or a semi-governmental agency, a spinoff of something in the defense department or CIA that gets little oversight, might be capable of producing something that can escape the purview of even the highest levels within our elected government (I suppose this thought is part of what has led some public officials to want to look into it).
And the government already admitted UFOs are real, and no panic, but I know what you mean.