Governments should prepare for the worst if aliens visit Earth because beings from outer space are likely to be just like humans, a leading scientist is claiming.
Wouldn’t they be just as likely to be able to visit us as we are them, then? Also, science fiction writers have saved us the trouble of creating these plans from scratch since they’ve thought through most of the possible permutations by now.
Not So Fast 
I just love the arrogance of us humans. You know, since we now know all there is to know. And, 1,000 years ago, they knew all there is to know as well …
Of course, to you and I, this translates into “we don’t know a thing”
So true.