Never assume malice when stupidity will suffice.

Finagle's Law - The perversity of the Universe tends to the maximum.
Finagle's 1st fundamental finding - Every string which has one end also has another end.
Finagle's 5th fundamental finding - The variables vary too much and the constants are constant enough.

Hanlon's Razor, a corollary of Finagle's law, is an adage which reads: Never attribute to malice that which can be adequately explained by stupidity. Also worded as: Never assume malice when stupidity will suffice.

Hofstadter's Law - It always takes longer than you expect, even when you take into account Hofstadter's Law. "Behind its whimsical façade, Hofstadter's Law is a profound statement of the difficulty of accurately estimating the amount of time it will take to complete tasks of any substantial complexity."