Resolves when a solution to the Fermi Paradox is widely agreed upon in the scientific community in response to empirical evidence.
People are also trading
If they don’t find a way to overcome the speed of light I couldn’t imagine a way for them to build an interstellar civilization
I suspect intelligent life starts traversing space only as solar-powered mind uploads that are hard to detect. Is that self-destruction?
hard steps:
1. getting a planet which is sufficiently massive to retain hydrogen for billions of years, but has a thin enough atmosphere for photosynthesis (we lucked out with the Theia impact shedding most of Earth's early atmosphere), and orbits at a reasonable distance from a stable star.
2. abiogenesis
3. eukaryotes
4. multicellularity
5. evolving enough intelligence to invent radio and build big transmitters before contraception/welfare/medicine induced dysgenics or nukes destroy that capability.
1st option but also interstellar travel is much more difficult than the "Fermi" paradox scenario expects.