I think it's in reality all a bit more mundane than the flashy headline suggests.

UFO secrets are not the same as 'alien' secrets. UFO just means that there is a big list of incursions of us air space that are unidentified.

The reason why it should probably stay secret is that a. it makes it possible for adversaries to know which secret-aircraft they aren't able to identify, and b. give adversaries a way to determine which types of vehicles aren't being detected at all.

I get it you people want to believe, and think its aliens, but it's not aliens.