No less a personage that renowned Italian physicist, Enrico Fermi postulated that if the conditions required for life to arise from non-living matter are as permissive as the available evidence on Earth indicates, then extraterrestrial life would be sufficiently common that it would be implausible for it not to have been detected.
Fermi said, “But where is everybody?”
There have been many attempts to resolve what is termed “the Fermi paradox,” such as suggesting that intelligent extraterrestrial beings are extremely rare, that the lifetime of such civilizations is short, or that they exist but (for various reasons) humans see no evidence.
How often do you drive a hundred miles out of your way to visit an active war zone, like a blue city ghetto during riot season?