Because we eat shellfish which can kill you. Though how they could possibly be polluted badly enough to be harmful in those days is beyond me. Maybe a Red Tide kind of thing. The Bible has little to do with God and a lot to do with law and order.
They should have made a law against gefilte fish.
Yeah, and this whole business about hats. One law says you have to wear one in "HIS" presence, another says take it off.
It's not a bad question, consider me stumped. I have some ideas but it's too involved to write out such a theological response to a question that isn't relevant to the foundation of the faith.
If your comment is too long, break it into multiple comments and post them all.