Incompetence

Incompetence is the inability to perform; lack of competence; ineptitude.

Administrative incompetence, dysfunctional administrative behaviors that hinder attainment of organization goals
Incompetence (book), a novel by Red Dwarf co-creator Rob Grant
Military incompetence, failures of members of the military

See also

Darwin Awards, a tongue-in-cheek "award" given to people whose incompetence results in their deaths
Hanlon's razor, an adage: "Never attribute to malice that which can be adequately explained by stupidity."
Peter principle, tendency for a person to rise to his or her level of incompetence
Dunning–Kruger effect, the tendency for incompetent people to grossly overestimate their skills