It's entirely cromulent to believe in the usefulness of markets while also acknowledging that certain contexts cause markets to be inefficient, and thus reduce their utility, possibly to the point of utter uselessness.

Natural monopoly? The market is inefficient.

Inelastic demand? The market is inefficient.

Negative externalities? The market is inefficient.

Markets are just a means, not an end. We should apply them judiciously, not religiously.