I wonder, why aliens were so specific about US only. They were sighted there only and no where else. Are they too aware of US being world super power...?
In eipstein case, i think, only one wil be the main culprit rest are just a supporting cast who were only involved in their pleasures things. . Government know how to keep the public entertained with ifs and bits of pieces.
They are seen elsewhere, but the US does have an abundance....