It’s possible to restore degraded coastal dune systems (basically sand + grass) by human intervention, but it takes a lot more work and time than just putting down a pile of sand. And the newly restored dunes also need restricted access, or they would just degrade very fast again. Properly creating dunes would also mean that these houses would lose their direct seaview (or be demolished if they are in the way), so it’s probably not even an acceptable solution to these rich twats.
In Belgium and northern France there has been a successful 15y project to restore hundreds of hectares of dunes. The budget was about 8m euros, so for the amount of coastline that these dunes protect, it was actually quite cheap.
If you make a comment like that on the wrong instance, that happens, but it’s not like that on every instance. Commie instances are filled with tankies and they have always been very dogmatic, just exhibiting nuance and historical awareness will get you those massive downvotes. Also deeper comment chains on more neutral instances can be weird, but that’s probably small sample bias because few people will dig down that deep.