Robert Alexy's claim that law of necessity has a dual nature raises many interesting philosophical questions. In this article, I consider some of these questions, such as what the meaning of the correctness thesis is, whether Alexy's discourse theory supports this thesis, and whether the thesis is defensible; whether Alexy's argument from anarchy and civil war supports the claim that law of necessity has a real dimension; and what the implications are of the use of moral arguments, such as the (...) argument from injustice, for the status of Alexy's inquiry. (shrink)