Ah, an Astrophysicist! I'll have have to take your word that your understanding of marine biology is comprehensive enough to dismiss any human impacts on beaches, despite much evidence to the contrary. (And no, your claims that you have "contacted the authors" of the papers is not an argument against the validity of those studies.)

If you had a background in ecology or biology (or actually spent any time studying the beach) you would know that there is abundant "macroscopic life" which is highly adapted to wave action, but is not at all adapted to foot traffic. 

The fact remains that the Clure proposal is in violation of the Shoreline Master Program policies, which state that public tidelands should include public uplands, OR be physically separated from private uplands in order to avoid conflicts. The westside beach a Critical habitat area and in that case environmental protection trumps public access.