Why do we have to preserve caves with fossils?

The presence or otherwise of visible fossils should not alone be the deciding factor. Caves are geological features worthy of respect and preservation just as with nature generally. Fossils exposed in the cave walls equally deserve respect as a feature of their cave; and are exposed by chance allowing us to admire them.

Beyond the aesthetics, fossils are often important stratigraphical markers, allowing correlation of rock units over wide areas, and caves are remarkably good natural archives because their interiors are not subject to normal weathering and vegetating.

Of the Southern English caves with which I am most familar for example, some hold numerous fragments of crinoids and solitary corals (in Carboniferous Limestone - called I think Pennsylvanian in USA). Others in Jurassic Limestone hold sizeable ammonites, seen in partial exposure or as moulds.