The psychological scarring is an interesting point, but that only works if you know why the snap happened.
By the end of Infinity War most of Thanos’s army and underlings have been defeated. Thanos then (within a few days/weeks) goes into retirement. So he’s not spreading word of his accomplishments or reasoning.
Carol mentions at the start of Endgame that a lot of other worlds need her help. So she could spread some information on what happened, but I’m not sure it’s going to really stick. You need the trauma of Thanos actually showing up (or his underlings and then the Avengers filling in the gaps).
GaMEChld@lemmy.world 12 hours ago
That’s a good point too. Perhaps there’s more interstellar communication going on out there with the likes of Nova Core and other technologically advanced space faring groups that word would spread. Surely people would be curious as hell as to why half of life turned to dust randomly and go looking for answers.
I imagine many societies with no definitive answer would probably end up in religious hysteria.