Arbitrariness in practice or in theory effectively devalues distinctions, reasons, and values all to zero. Insistence on arbitrary power, arbitrary rights, or arbitrary freedom utterly abnegates normativity and reason. (See also Desire of the Master; Tyranny.) Denial of the principle of noncontradiction opens the door for unprincipled sophistry that has the same nihilistic effect. The idea that something genuinely new can only come about through arbitrariness reflects a profoundly impoverished vision.
Theoretical assertions of arbitrary power or authority originated in bad theology (see Strong Omnipotence; Occasionalism), then found their way into modern political theory via one-sided notions like sovereignty. Modern individualism and subjectivism tend to make similarly one-sided, effectively nihilistic claims on behalf of individuals. Sartrean existentialism and Badiouian decisionism are particularly extreme examples. (See also “Hard” Kantianism?)
Rather than valorizing or justifying arbitrariness in actions, we ought to always aim at contextually appropriate applications of reasonableness and respect for others. (See also Practical Judgment; Freedom from False Freedom; Categorical “Evil”.)