yes any possible backlash will be about the destruction of the usa by the illuminati and the plan to kill at least half of north america. they can toss the ET thing in if they wish to create even more chaos. disclosure on its own wont cause people to riot. in fact if there was not a nefarious plan to destroy humanity right now and it was all sweetness and roses then people would be pretty cool about it.
humans are genrally a nice bunch hence we are in the state we are in. nasty elements taking advantage of us easily.