So laws like North Carolina's ban on considering any global warming effects beyond 30 years? Pretty much criminal, and obviously written by a bunch of 70-year-olds who don't think they'll need a beach house after that, plus some 50-year-olds who think they'll be retired from politics by then. I used to live in Delaware and New Jersey, both states with beach industries constantly affected by erosion and flooding, and North Carolina's coastline is the same way. If the sand washes away your property values drop and then your house washes into the ocean, and when the barrier islands are gone, the mainland starts to go pretty fast also.
I pretty much entirely disagree with you.
First things first, I live in North Carolina and my family has been going to the same island on the outer banks for about 60-70 years now. It's a part of the state I feel connected to and where I would really like to see NC avoid so many of the abominable excesses of the Northeast, Florida, etc. I've met and talked with Orrin Pilkey about some of these very same issues. We agree on many things but not all things.
I think we need major reform to insurance laws and who pays when beach property owners suffer losses. I don't it's fair to privatize profits (rentals, etc) but socialize the costs (beach replenishment, hurricane damage repairs, etc).
I think we need major limits on the kind of beach construction that is allowed (again, let's avoid the Northeast and Florida models), and where it is allowed.
I actually think NC, so far, has done a pretty good job of maintaining its beaches and islands and natural spaces. That's one of the reason the coast fills up with Ohio, Pennsylvania, NY, etc license plates every summer.
On to the juicy stuff!
Issues of jetties, replenishment, dredging, erosion, viability of coastal roads, etc, are all linked to the climate (and therefore climate change), but are also independent of effects 30 years out. If a beach is eroding TODAY (and some are--some are replenishing today--that's the way it goes!), stakeholders are going to want it dealt with today, consequences be damned. Forget the consequences 30 years out! If enough beach property owners make noise and can get a jetty built today, well, ignore the immediate consequences, it's built. The 30-year time frame is again irrelevant to the stakeholders.
The island I go to every year has horrible erosion on the north and the middle. They are constantly dredging and replenishing certain parts of the island. This has very negative effects on the beach and sea life, and is, at best, a temporary patch. They're also losing the battles. Some of the older houses are literally sitting in the water at high tide. On the south end of the island, the island is growing, The beaches are getting bigger, and the island is actually migrating south. That's just what barrier islands (non-rocky islands) do. At some point those on the north of the island are going to have to bite the bullet and lose their properties (or more like lose their properties in a hurricane and not be allowed to build). I say, tough luck, but if you chose to build or buy on the beach, you have to be prepared to take those risks.
So, please don't take this as a defense of beach property owners and stakeholders, it's just an "it is what it is" situation.
Getting to climate change models though, that's a different question entirely. For one thing, I (personally) have no trust in the models beyond thirty years. I don't have any faith in the models at thirty years truthfully. I do not believe it has been demonstrated that climate predictions of thirty years ago--or, specifically in the beach context we're discussing, ocean levels predictions of 30 years ago--are accurate. I doubt our predictions today are any better. Second, the 30-year window is a rolling window. If trends accelerate over the next 5 five years, well, the models can account for heightened results over the NEXT thirty years.
I don't know you or your beliefs at all, but like so many things in our society today, I think this particular "NC rethuglicans bans global warming AND HATE THE PLANET Zomg!!!!" talking point meme is way overblown and has become part of a needlessly didactic argument. It's not nearly so simple an issue as you seem to think.