Isn't the answer simple that: they have things to hide?
I see it in my crystal ball: They collect the disassembled parts of downed and captured flying saucers kept for decades in place such as
Wright-Patterson, in Ohio, ship them to Area 51 to be packed them away for eventual museum distribution once they reveal our versions (the black
triangles) and admit to UFOs being alien craft, and...wait!
Second thought: They are hiding exotic materials and chemicals they used over the decades and don't want the EPA or anybody snooping around.









