If you knew anything about economics you would know that it already takes into account human nature. I don't see how you can even claim that economists are clueless about math, when all they do every day is math; calculations, graphs, comparing data, etc... that statement just made me cringe.
I've studied both Economics and Mathematics by the way, and economists do in fact know shit all about Maths. Even Economics Ph.Ds have barely any understanding of real mathematical theory and profound modeling.