Yay... more depressing news of how humanity fucks it up for the rest of the world.
Yes, fuck the thing that created you and that you are a part of.
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You can't force someone to think coral is important, but in terms of ecology, it's very objectively vital to hundreds of fish, cephalopods, crustaceans and molluscs.
It's also something that many islands nature rely on for tourism as well as fishing.
I'm not sure if that certain poster is a troll or a huge moron, I mean a moron of legendary proportions. Can't say who without getting infracted, so you will have to guess.