I have always had an interest in UFO/Aliens (though never seen any) and what is so obvious about all the stories is their technology. I have read stories and seen project reports claiming interaction with certain secret organisations in which these deals have failed to be complied with.
One of my beliefs is that we will indeed one day be visited in the open for all to see (not just the few) and this would surely scare the crap out of those who think they are in control of our lives (our government/Illuminati?..depending on your way of thinking!)..
I think to set up security measures that all the people would agree to be controlled, there has to be a major event on a global scale (like a hostile Alien Invasion) and even though this would be catastrophic for many lives.. the government will step in and 'Win' the (fake) war.
This to me would have a major impact for when the alien races do start to visit this planet as they would never be accepted through fear caused by the fake war.