Hanlon's razor
A corollary of Finagle's law, Hanlon's Razor reads "Never attribute to malice that which can be adequately explained by stupidity." The derivation of the common title "Hanlon's Razor" is unknown; a similar epigram has been attributed to William James. One possible derivation is from the similarity to Occam's Razor. The website Status-Q attributes it to one Robert J. Hanlon who seemingly contributed it to a book about Murphy's law.A similar quote appears in Robert Heinlein's 1941 short story Logic of Empire: "You have attributed conditions to villainy that simply result from stupidity." It is possible that the term "Hanlon's Razor" is a bastardisation of "Heinlein's Razor."
This maxim is also widely attributed to Napoleon Bonaparte.
General observations on the predominance of human error over malice occur in various works of literature; Goethe's The Sorrows of Young Werther (1774) mentions: "[...] misunderstandings and neglect create more confusion in this world than trickery and malice. At any rate, the last two are certainly much less frequent."
Hanlon's Razor is a particular favorite of hackers, often showing up in sig blocks, fortune cookie files and the login banners of BBS systems and commercial networks. This reflects the hacker's daily experience of environments created by well-intentioned but short-sighted people. Compare Sturgeon's law.