Clarence Dacre, has come out of the radio noise and explained why SETI has not managed to find a signal - yet.
[I've posted a direct link to it above... but it doesn't all appear for some reason.]
I don't know why you say his claims are "SF".
Travel at or near or even a tiny percentage of lightspeed is the 'science fiction' - and will remain so. Certainly the speed of light and beyond
will remain forever fiction. And that is a universal constant that may determine how any species in our stellar neighbourhood and beyond may act.
Surely any advanced ET would use its technology of light speed communications, or any beyond that if it exists, not necessarily to communicate, but to
Trojan its way through the cyber door. Where's the fiction in that, it's entirely plausible.
In fact. lightspeed communication (for now not beyond LS), also brings the opportunity to cyber colonise other species, over vast distances, and vast
stretches of time; our computers laying down the thoughts, ideals and technologies of an alien ET species - by stealth.
In fact there might be a moral imperative to intercede in such a manner, rather than by a more physical approach.
In fact, providing the targetted species (that's us or them) had a qualifying technology to make the undertaking worthwhile, it woud be a universal
duty; if not for curiosity's sake alone.
The world-wide-web may prove to be an Interstellar-web (ISW) that connects us to our future friends - or masters. (Likely the latter.)
Reverse the thought.... A species four light years away has just discovered radio, then TV. Do you wait for the technology of Alpha Centaura Proximus
to catch up with you? Do you help them catch up with you? Or do you wait until the time becomes right to add those 'controls' that would allow...
Beats crawling along at sub-sub lightspeed, landing in a huge flying dish, saying "Take me to your leader (if you can all agree on one). And, oh, you
worship what type of being?"
Oh... I forgot.... And the stellar species you have been 'watching' is incredibly unpredictable; it goes to war quite often then makes love with its
enemy, it is paranoid then apathetic, and the images on its tv well... that comedian George W Bush is quite funny.
Would you not seek to enslave its technolgy? If so, with what? It has a stellar technology in its infancy (the world wide web and others). Why not
send a Trojan... then, when they listen for signals, all they get is ... background noise, and a peaceful yet chaotic universe.
Galactic censorship.... just the way we like it on Planet Zeephelbrod.