This chapter examines the duties of states to insiders (people living within a state’s physical territory) and outsiders (people in other states). It is argued that states have, provided the initiation of securitization is otherwise justified and that must cause is satisfied, an overriding duty to secure insiders from objective existential threat via securitization. Regarding morally mandatory other-securitization, the picture is more mixed, a range of costs to the self, including (1) the risk of death, disease, and disability; (2) the risk of instability and insecurity; and (3) financial costs can override an individual state’s obligation to secure and – where necessary – securitize outsiders from threat. This chapter goes on to examine what happens to pro tanto duties if states are liable for threat creation abroad. Moreover, it suggests a ranking of different triggers for remedial responsibility derived from common-sense morality, enabling the pinpointing of specific states as primary duty-bearers for morally mandatory other-securitization.