- Advanced civilisations will use very little broadcast, what they do use will have little escaping.
Even our broadcasts at Analogue Peak were not detectable above the cosmic noise at any sensible distance
- Statistics, Stoichiometric modelling and probability suggests that you get gaps and clusters of Civilisations. Randomly "dust" a large table with "sprinkles" AKA "hundreds and thousands" with your eye closed to see what I mean.
- Maybe we are in Quarantine of some nature
- Maybe only sub light travel is possible (No Jump drives, Star Gates, Wormholes, warp bubbles, Hyperspace or near speed of light 'conventional' craft) What a pity!
I don't think Seti is likely to "work", as a former RF Communications engineer, it can't possibly get a signal unless very close and beamed deliberately. I don't think the Fermi Paradox looks at all the angles, actually I think it's a little pointless
It seems that the sort of stars that are sensible for life as we know it and planets around in Goldilock's Zones is much more common that had been supposed.
Strangely our Galaxy has a convenient set of interstellar navigation beacons we ourselves are accurately charting.
http://phys.org/news/2013-05-scientists-pulsars-spacecraft-solar.html
We are charting them well enough even to navigate within the Solar System, never mind hypothetical Starship use. Are they really a fortuitous quirk of nature?
But Europe is pretty amazing, it's really Middle Earth, Rivendell is really in Switzerland. Earth is fabulous. Both the Wilderness, Oceans, Cities, vibrant cultures of different regions, food, sex, animals, Plants. Many things more amazing than you'd imagine. Ancient Babylon, Cambodia, The Middle Kingdom, India, Pre-European Americas. How a Camel stores water and avoids losing it. Duck-billed Platypus. Marsupials including nearly flying ones. Miniature marvels such as Water Bear and Hydra. Not long extinct Roc like birds in NZ. Wolves help trees to grow.