The Fermi Paradox
“The Fermi paradox (or Fermi's paradox) is the apparent contradiction between high estimates of the probability of the existence of extraterrestrial civilization and humanity's lack of contact with, or evidence for, such civilizations.“ (Wikipedia)
If you had moved home to a new location far away from your previous one, and wanted to go out and make friends, which of these is least likely as a place to look:Sporting club?
Social club?Educational institute (e.g. evening classes)
Special interest group e.g. Astronomy society?Street full of knife-wielding brawling drunks?
I’m assuming you picked the last as the least likely. On that basis, why would inhabitants of another planet pick Earth as a planet to be friends with?For all we know, we were visited in the distant past and have been shunned ever since because of the constant warring.
That, I believe, is the explanation for Fermi’s paradox, and, incidentally, why SETI is a bad idea. We need to be careful whose attention we attract: there could be planets out there whose inhabitants are even worse than ours.