The Japanese earthquake caused nuclear radiation. Why do so many people buy salt?

Now everyone is panicking about not having salt to eat. The Japanese nuclear leak caused nuclear radiation, which will affect seawater. Salt is extracted from seawater. When seawater is polluted, natural salt will also be affected. There will be less salt. This is generally what everyone thinks, but please don’t panic. Only a small part of seawater salt is extracted from seawater, and most of it is on land. How can a country as big as ours allow everyone to have no salt? As for eating, some salt merchants are also deliberately driving up the price of salt.