Government and Aliens fact or fiction, I really want to know?

A thought experiment of logic and realism.  We've all heard or seen some story/video of alien cover up conspiracy at one some point but what is the truth and why the mystery?  Well let's break it down to the simplest form: (1) Aliens exist and are here now  (2) Aliens don't exist.  Now what does it mean for the World for each?

(1) Everything we ever believed in is wrong, God, our own galactic supremacy, how life began on earth etc...   Wait a minute though but what does that really mean if the public found out it were true,  it means God doesn't exist and the church no longer has any power (gasp) they already don't, it means governments can't make war on each other because the public would panic and either act a fool or want to unite against the alien threat (omg were all gonna die, lets act stupid until it happens) and we all know that war generates $billions$ for the economy as well as power on control over the populace.

(2) Aliens don't really exist, well if that is the case something's still being covered up using alien conspiracy (black projects maybe, secret genetic experiments on the public), what would be so important to hide by getting everyone to look at alien conspiracy instead asking the right questions? 

 So if aliens are real and here (which I personally believe to be true - just run a video search on Atlantis, Solar Warden, Grays, Reptilians, etc...) why are the world governments still covering it up (uh we've lied so long we don't wanna get in trouble for it so we keep lying, or aliens are hell bent on genocide and/or enslavement).  I say who cares about the church, wars, public panic, etc... I want to know the absolute truth.  I challenge the world to come clean with the entire history and tell us the truth.  Did Star Trek, Star gate, and Farscape hit closer to the truth than anyone realized or were those television shows really training videos to prepare the public mindset,  tell us about it hell I'll sign up to fire a phaser or pulse pistol at any hostile aliens.  If aliens aren't real I still want to know what the hell the government is covering up.

     What would happen if four or five hundred thousand people showed up all at once to surround and invade areas 51 and 52, kicked in the doors and actually found out what was going on.  would it spark an Alien vs. Terran galactic war or would it just expose a government plot to exert absolute control over the populace.

To all Governments of the World:  It is time to admit the truth whatever it may be, we're ready to know!