To its proponents, it marks imperative action in the face of human rights abuses, over the rights of state sovereignty, while to its detractors it is often viewed as a pretext for military intervention often devoid of legal sanction (as indeed a new customary law norm would require sufficient state practice) selectively deployed and achieving only ambiguous ends. Its frequent use following the end of the Cold War suggested to many that a new norm of military humanitarian intervention was emerging in international politics, although some now argue that the 9/11 terrorist attacks and the US "war on terror" have brought the era of humanitarian intervention to an end.