The seawall was shorter than it should have been, that is a planning and design failure, not just ignoring warning signs.
There also doesn't seem to have been any planning for a situation where the seawall failed (the inundation rendered the on site backup power inoperative). Adding a second layer of protection to such an important system would not be particularly aggressive.
There also doesn't seem to have been any planning for a situation where the seawall failed (the inundation rendered the on site backup power inoperative). Adding a second layer of protection to such an important system would not be particularly aggressive.