Look at it this way. Sea animals swim about in their own shit, and ours. They eat both their own shit, and ours. Not only this, the sea is made of salt and water, one of those things tastse bloody awful in any reasonable quantity which is why all seafood tastes like sticking your tongue in the back of a grit wagon.
If seafood doesn’t taste like this to you, then you’ve clearly got underdeveloped taste buds and can’t be trusted to choose your own food.[1]
And this is why seafood is a bad thing.
[1] All seafood to me tastes like concentrated salt. I can’t taste anything else. Other people around the table will be saying how great this sea bass is and I’ll be throwing up onto the floor.