With so many alien civilizations out there, why haven’t we found them, or why haven’t they found us? That is because of the obvious reason that we are a self-destructing race, where we don’t know how to live in peace and haven’t learnt to love our fellow humans in the first place.
I just want to remind you people that there’s very little time on earth left. By the time you realize and try to let your heart out, poof, everything will be gone, in a jiffy. Just like the burst of wind on a pile of leaves before the arrival of a storm.