Easy for you to say when you have a full stomach. See what happened in countries that disregard their farmers or agricultural sectors. Food price soared, and social unrest set in leading to crime, anarchy and governments collapsing.
People need to eat, simple. Hungry people will eventually turn to crime to survive, including the people paid form your taxes to protect you (police, military, etc)
Being agriculturally self sufficient is essential for any country.