A useful narrative can capture your thinking.

A useful narrative helps make sense of an uncertain, foggy reality.

When a narrative starts to distill, things that strengthen the narrative will be no-brainers to glom onto.

Things that threaten the narrative will be subtly or actively ignored.

The narrative becomes more and more self-coherent... but potentially decoheres from the actual ground truth.

If others only hear the narrative (and don't have any relevant priors), they will likely find it convincing due to this satisfying self-coherence.

But if the counter-narrative evidence is later discovered, it can shatter the narrative.

In some cases your receivers will already have disconfirming background knowledge or priors "Wait a second, aren't you ignoring..."

In that case, the narrative might not ever be adopted in the first place.