I wonder why Area 51 is being restricted area for such a long time. Does they hiding something? Or does they covering up about aliens? Who knows?
I know the alien stuff is nonsense, and it's just military tech.
But just to entertain the thought, if there were anything of the sort that needed to remain super-secret from the public. It wouldn't be stored at area 51. Since everyone is focused on area 51, it be stored in a place we wouldn't know of, lets call that "area 52". So even if in the crazy case millions were to raid area 51, looking for this so-called super-secret stuff. You'd find perhaps secret stuff.
But the really good stuff, wouldn't be stored there. So either way, the obsession with area 51 is rather irrational.
My two cents.