Why are people freaking out over rising sea levels, if we already had sea level fluctuation in the past?

Did you know that cities like Pisa, Pompeii as well as some of the other ancient Roman cities in Turkey and some other places used to be coastal port cities. But overtime the sea-levels shrunk, and they turned into inland cities.

I know that some atolls in the Indian Ocean and Pacific will sink, but there was nothing there before either. If those cities I mentioned used to be on the coast and sea levels are rising, doesn't that suggest that the sea levels are actually returning to how they used to be? I feel people are freaking out because THEY will be displaced, but the earth itself will be fine. It is not caused by the people. We chose to built on Mother Nature's turf and there's nothing we can do to stop it. We'll just have to move our asses like the ancient people.

https://www.ancientportsantiques.com/ancient-port-structures/silting-up/

Why are people freaking out over rising sea levels, if we already had sea level fluctuation in the past?
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