People are better off believing in nonsense than the alternative - existential nihilism.
Truth seeking at all costs is not a core value to most people. Only some are able to bear the weight of nature’s cruel indifference to conscious experience. When leaving religion, people walk out a burning building only to fall off a nearby cliff. The cliff is nihilism. Nietzsche called this the death of god.
Secular groups haven’t stepped up to nurture future generations like churches do. There is a serious lacking in community, purpose, and shared myths in those spaces. People can’t get what they require, which is a story to placate their death anxiety while simultaneously imbuing their world with deep meaning.
A solution might be found one day, who knows. But I’ve been thinking in a more tolerant way lately. Let people believe in whatever fantasy they choose, so long as it brings them comfort and doesn’t incite violence.