Final answer:
Danforth refuses to pardon the accused because it would be unjust in light of the twelve who have already been executed for the same crime, showcasing the importance he places on legal consistency.
Step-by-step explanation:
The reason given by Danforth for not pardoning the accused is that it would be unjust to do so after twelve have already been hanged for the same crime. Danforth is seeking a form of justice that is consistent and fair in the eyes of the law and societal standards, even though this may not consider the actual guilt or innocence of the individuals. He highlights the importance of maintaining the integrity of the judicial process and avoiding the implication that the previous executions were unjustified.