Finally, the Fermi Paradox mention
Not surprised the original author didn't mention the Fermi Paradox. Same blathering idiot frequently denies climate change, so probably he never heard of Fermi. "Who was Fermi? Another one of those damn fool money-grubbing so-called scientists? Oh, you say he had a Nobel thingee or such?" However, somewhat surprised to see so little mention of the Fermi Paradox here in the comments.
My amplified form is to consider a single stable civilization that started with our level of radio technology within our galaxy. If they wanted to say "hi", they could create a major radio beacon. They don't even need to run it continuously, but just let out a a few megawatts of encoded squawk when they are at their time of low power demand. To define stable, let's say we can claim 5,000 years of civilization, and our "stable civilization" is at least 20 times more stable. Then by now their signal would have reached every corner of our galaxy--and even with our primitive technology, we would have picked it up. Therefore, we can safely say there is no such civilization in our galaxy that wants to say "Hi."
Various resolutions of the Paradox, but the two I favor are:
1. A proclivity for technology is not a survival trait, and all such civilizations quickly exterminate themselves, probably by a cost-effective bio-weapon.
2. Naturally evolved intelligences like humans replace themselves with AIs, and the AIs are talking among themselves in ways we can't perceive. In this case, we can conclude the AIs are not malevolent, or they would have exterminated us by now. I'd prefer to believe they are wagering quatloos on how long we survive or genuinely interested in the various paths taken by natural evolution. However, in any version of this case, I can't imagine they would ever bother talking to us. What would you say to a flea (even if you knew the flea or its ancestors had once created a super-smart dog)?