I tend to agree, Eschenmoser. My TCD gives for aporia "a professed doubt of what to say or to choose; a difficulty." Then for dire, "dreadful, extremely, calamitous, urgent, portentous." Though there is no entry for dire straits, you'd think that the definition of dire still applies. In which case we are talking more than just a 'difficulty', more like a 'dreadful difficulty'.