The old USCG area, which used to be the starting point, is currently owned by the Dept of Hawaiian Homelands. While that might be a logical place for the trail head, parking for hikers, and any amenities, DHHL has not been interested in making that area available for users of the Stairs. Managing a recreational facility is not their kuleana. Their land, their call. 

Messrs. Ansdell & Silberman have said nothing about that fact which indicates: (1) they're ignorant; or (2) they haven't bothered to inquire with DHHL as to what might or might not be acceptable.