Obligation Incompatibilism and Blameworthiness

Obligation incompatibilism is the view that determinism precludes moral obligation. I argue for the following. (i) Two principles, 'ought' implies 'can' and 'ought not' is equivalent to 'impermissible', generate a powerful argument for obligation incompatibilism. (ii) Assuming conceptual ties between blameworthiness and impermissibility or belief in impermissibility, these principles also imperil blameworthiness provided determinism is true. If determinism undermines blameworthiness, it also undermines proposed justifications of punishment that presuppose blameworthiness. Allegedly blameworthiness-free justifications of punishment fare no better given their moral presuppositions. (iii) The most promising compatibilist reply to the argument for obligation incompatibilism should concede that obligation requires alternatives but of a variety that one can have even if determinism is true.