I can not be in the same place as raw shrimp - I can not go into most local seafood markets because they keep the shrimp on ice, but in the open not in a glass case.
Seafood is not harmful to the public at large.
It is for some people.
Someone who was deathly allergic to peanuts could choose not to work at a Thai restaurant, for example.
Those afraid of tobacco smoke can simply choose not to work in an establishment that permits smoking, for example.
Hello—if you’re that allergic to raw seafood, you can not work in a fish market.
The theory, right or wrong, is that second-hand smoke is bad for everyone, where of course exposure to raw shrimp in the rare environment of a fish market isn’t bad for the majority of people.
Again, right or wrong, the theory is that second-hand smoke is bad for everyone, not just some rare few.