This has long been one of the biggest flaws I see in much of Science Fiction.
Too many Alien worlds that seem to be mono cultural and mono religious.
While is might be true that as a planets culture and technology advances some standardization might occur it seems very unlikely to me that billions of people will choose the same path and ideology. It is true that the only real world example we have to work with is Earth , but it has never really made sense to me that there tends to be only one culture and spiritual belief system left standing on so many of the planets seen in Sci Fi.
Too many Alien worlds that seem to be mono cultural and mono religious.
While is might be true that as a planets culture and technology advances some standardization might occur it seems very unlikely to me that billions of people will choose the same path and ideology. It is true that the only real world example we have to work with is Earth , but it has never really made sense to me that there tends to be only one culture and spiritual belief system left standing on so many of the planets seen in Sci Fi.