There are also weak nations so utterly incompetent either to protect the rights of foreigners against their own citizens, or to protect their own citizens against foreigners, that it becomes a matter of sheer duty for some outside power to interfere in connection with them.
 Theodore Roosevelt, Theodore Roosevelt; an Autobiography (1913). copy citation

Context

“There are big and powerful nations which habitually commit, either upon other nations or upon sections of their own people, wrongs so outrageous as to justify even the most peaceful persons in going to war. There are also weak nations so utterly incompetent either to protect the rights of foreigners against their own citizens, or to protect their own citizens against foreigners, that it becomes a matter of sheer duty for some outside power to interfere in connection with them. As yet in neither case is there any efficient method of getting international action; and if joint action by several powers is secured, the result is usually considerably worse than if only one Power interfered.” source