Sorry, just now I saw your reply.
This is a very difficult topic and how things really happened we don't know.
In my personal opinion/belief we might have circled in delusion since a very long, long time in many, many forms.
Delusion is obviously also present in animals and also other beings we might not see. So I don't think it is a collective human problem but a problem of beings in general.
The good thing is we know something about how to get out of this situation again and I think if somebody has really longing for union again there will be guidance in many ways.
Thank you for bringing up this profound topic!