Regarding your first point, I doubt the people would hate on the KR for that. Their conception of history is so distorted they barely even know what Voidbringers are. I highly doubt they would have known there were other creatures who posed a threat other than Voidbringers. The people have believed themselves safe, that they’ve won, after the Last Desolation.
Regarding your second point, if the people were hating on the KR because they had gone about killing people, then wouldn’t Dalinar, who knew the truth from his visions, have felt compelled to speak otherwise?
And regarding your third point, while it is very valid, I don’t think that’s the main reason. Otherwise it wouldn’t be considered a failure of Vorinism; just an economic failure.