Which is the greater threat?

Construction of our local wall (folly?) continues...

This area of the beach is unsafe due to recent erosion.

Exposed rocks in the water and on the beach.

They missed a few other adjectives before "erosion".  Things like "persistent, predictable, regular, ongoing, relentless".

Intellectually I get the need for safety in the workplace etc etc, from an immediate threat, but the juxta positioning of these two signs give me an unjustifiable feeling akin to sheltering under desks during the cold war.