[eivarv]

My own speculation basically boils down to: Human minds are primarily meaning-seeking machines, to such a large extent that we even create meaning where there is none (apophenia).

Take pareidolia, for instance – it's likely been more evolutionary advantageous to see faces where there are none (and thus flee tot often), as opposed to not seeing faces where there are faces (and thus be eaten).

And in evolutionary terms, not everything that exists has some benefit. Some features just haven't been subject to evolutionary pressures; Not selected for, just not selected against. Vestigial features are prime examples of this.