Sorry everyone. One of those ships of theirs would probably be able to take over the planet on its own. Supposedly these ships have been observed disabling nuclear missile silos. If they were communists, they would probably want to liberate us. They would likewise be able to do so right this moment. But they don't. Therefore, they aren't communists. Facts and logic :expert-shapiro:
How could a non-communist society send ships to other solar systems? It's possible. Something like Breakthrough Starshot could conceivably happen before a communist revolution on Earth. The USA, a fascist dictatorship, sent people to the moon.
If the UFOs are real, I think that they're some kind of automated probe(s) which were actually sent here hundreds if not thousands of years ago. (The earliest recorded UFO sighting was in 1440 BC.) As mentioned on the most recent episode of Guerilla History, UFOs might have been triggered or made more active somehow by the first detonation of an atomic bomb.
The civilization which built them might not even exist anymore, but their technology is evidently still way ahead of ours, which means it could be quite some time before we ever figure out what these UFOs actually are.
Something is definitely going on, though, whatever the fuck it is. The podcast mentions a guy I had never heard of named Ron Westrum. He gave a talk here mentioning how alien abductions probably aren't all in people's heads, since they sometimes happen to multiple people at the same time or are observed by others who are not abducted.
All of this generally shows that in spite of what people tell you, nobody really knows what the fuck is going on.
I think that maybe not as much variation as we'd like to see is possible. Obviously things like outdoor cats and lawns would spin differently.
They would still have issues around reproductive rights. At some point in a species development it is going to make sense based on resources to control populations. if they Are a R type reproducer instead of our K type reproduction model it would be different. however, for any given K type species we can expect them to have gone though issues similar to ours. It would be better for the group to have more units, but it is costly to the individual to produce more units. So at some point birth control would be invented. Then a faction would want cheap labor and try to fight against it. What I am saying here is that dialectical materialism is the riddle of history solved, even sci-fi histories.