They should, they really should. It's just "spitting into the wind" to live anywhere that is below sea level and near a coastline. Flooding is Nature's way of telling you to move.

Sure we admire their ingenuity and hard-work ethic and how they recovered the land from the sea but that same energy probably could have been applied with more productive results somewhere else. Look what the Mormons have done with Utah. Maybe the Dutch could have done something similar with Montana (or even Minnesota). I'm certain they would have done a better job with San Francisco than we've done.