Who gets to determne what the laws of nature are and how they are o be applied?
Already you have discovered the attraction of natural law. You get to design the rules based upon your discovery of objective principles concerning how the world functions. The idea is that you search for and discover truths about the world that are enduring and immutable.
The usual goal is to arrive as quickly as is philosophically possible at the conclusion that all compulsion is evil, that all government is founded upon evil compulsion and that all taxes are theft. The rest is left up to you. ;-)
The same people who determine when mathematical formulas are correct. Those with the necessary intellect to do the math.