Yes. It agrees with my confirmation biases, but...

The "Sustainability Solution" to the Fermi Paradox.

Big text, right? But it's a big idea. For those who may been under a rock for a few decades, the Fermi Paradox, first suggested by the physicist, Enrico Fermi, asks, "If the universe has so many stars with potential for habitable planets... where is everybody?!" The "Sustainability Solution," and it's complimentary opposite companion, the "Eschation Hypothesis" suggests they are living within their replaceable resources and are, therefore not emitting strong enough signals to be easily detectable against background radiation of their star, and all the others around it. The Eschation Solution complemtarily postulates that, when the do stick their heads up above the background noise of space, they'll be using so much energy, they will be bleeding their planet dry to do it and will be extinct by the time we detect that signal. Think nuclear war, or a runaway matter/antimatter explosion - an artificial planet killer event. As per this video...

It's pretty nihilistic stuff, right. I prefer to frame its opposite, that we can't easily detect sustainable civilisations, but Eschaton (the ancient Greek apocalypes legend) may be the outcome for those who command godlike energy and matter control while living in a finite planetary ecosystem. These two hypothises, bookened my "Not by Radio" hypothesis, very nicely, and it dovetails nicely into the "Scilla and Charybdes" of sustainability versus Eschaton.

Radio is available to potentially sustainable, engineering civilisations, but it cannot be sustainably powered to signal strength required to break through the background radio emmissions of a star sustaining a planet with life. Put a 1 watt UHF CB radio on the same channel as a 100 kilowatt UHF TV transmitter and you'll lose the signal very quickly as it increases it's distance from you while decreasing its distance to the TV transmitter. The level of radio signal we would need to generate on Earth, in order to be discriminable from the Sun's broadband noise signal, would almost certainly require highly destructive levels of energy generation to power. Those kind of signal strengths would also make for a pretty destructive radio beam, as well. "Don't poke a skewer into the door switch hole on your microwave and press start," magnified by hundreds of decibels! (seriously, don't disable the safety switch on your microwave oven. Just don't, you idiot!)

So, Enrico, "Where is everybody?" Living quietly like dormice (dormouses?), mate. Too quiet to hear.