They are above all intolerant of the argument: “I can’t spare this man; I’d be in trouble without him.” They have learned that there are only three explanations for an “indispensable man”: He is actually incompetent and can only survive if carefully shielded from demands; his strength is misused to bolster a weak superior who cannot stand on his own two feet; or his strength is misused to delay tackling a serious problem if not to conceal its existence.
