I think it’s safe to say that the “official discovery” of other intelligent life in the universe would be the single most important event in human history. If and when we “officially” make contact with those beings would certainly equal, and perhaps exceed, that primary event in significance.
But such discoveries could also pose huge problems for our world, especially for those rather primitive elements like our religions and belief systems. Additionally, worldwide recognition of such realities would also be the cause of colossal concern for the traditional power structures such as governments, economic, military and political establishments. After all, the reality that far more advanced and powerful beings exist that can freely operate outside of any terrestrial constraints would be viewed as dangerously destabilizing to all power and control structures. Such fears are completely understandable, if not actually fully warranted. Certainly to be approached by an outside race that would logically also have some pretty tremendous weaponry and technological power, etc., would arise primal fear in many people. Of course such fear would be all the more understandable in light of how we human beings of Earth would quickly assume that the approaching visitors were similarly motivated, i.e. were at least as irrationally violent, barbaric, bloodthirsty, brutal and aggressive as we are. [...]