what is meant by a prima facie obligation
Prima facie The phrase is also used in academic philosophy. Among its most notable uses is in the theory of ethics first proposed by W. D. Ross, often called the Ethic of Prima Facie Duties, as well as in epistemology, as used, for example, by Robert Audi. It is generally used in reference to an obligation. "I have a prima facie obligation to keep my promise and meet my friend" means that I am under an obligation, but this may yield to a more pressing duty. A more modern usage prefers the title pro tanto obligation: an obligation that may be later overruled by another more pressing one; it exists only pro tempore.
Uncle Ben The origins of the phrase pre-date its use in Spider-Man. In 1817, member of British parliament William Lamb is recorded saying, "the possession of great power necessarily implies great responsibility."[33] In 1906, Under-Secretary of the Colonial Office Winston Churchill said, "Where there is great power there is great responsibility",[34] even indicating that it was already a cultural maxim invoked toward government at the time.