[With] enough money, you can build buildings resistant against the wind. The force of water is completely different. We don't have the technology or the economic feasibility that can withstand the forces of moving water.
If you widen a beach, then yes, you will reduce impact from certain storms. But take a big hurricane, something like Katrina, and there's no artificial beach we know of that would've prevented that kind of destruction. That did nothing.
What people don't understand is that the market for development on the beach will never go away and even if that front row of houses is lost due to erosion or storms, the row behind it will act as a new frontline or a new row will always be built. The demand for more houses will never cease.