Are you being intentionally obtuse? You asked why salt, he answered with literally the most important reason in public health: people actually use it. It is a k

Are you being intentionally obtuse? You asked why salt, he answered with literally the most important reason in public health: people actually use it. It is a known delivery vector that works, period. And, yes, no shit. How to get other people to do something is a fundamental question in life and it just so happens that in life, public health is about getting people to do stuff that's good for their and society's health.