People do, sometimes, get sick from shellfish. Some ancient cultures reacted to this by creating a food taboo against shellfish (I believe Jews and Muslims do t

People do, sometimes, get sick from shellfish. Some ancient cultures reacted to this by creating a food taboo against shellfish (I believe Jews and Muslims do this). Other cultures have implemented monitoring for "red tide" conditions and restrict shellfish harvesting accordingly. As human beings, when we make a mistake that leads to diseases that kill people, we do what we can to avoid making that same mistake twice. I'm not sure why this is an objectionable or questionable notion.