Rising sea levels are much less of a problem than a constant series of rain bombs, storms, droughts, and fires.
When you get a Milton and/or a Helene every few years - or every year, or more than once a year - there's no practical way to rebuild, and insurance will be a distant memory.
The only reason most people don't know this is because extreme weather events around the world aren't making the news unless they're local-ish.
Hardly anyone in the US has heard about Acapulco after Otis, or the recent rain bomb storms in France, Spain, and Italy, or the flooding in Iran, or the fact that large areas of arable land in the UK are waterlogged and farmers are promising significantly smaller crop yields.