[…] when he recollected that, being there as an assistant, he actually seemed—no matter what unhappy train of circumstances had brought him to that pass—to be the aider andabettor of a system which filled him with honest disgust and indignation, he loathed himself[…]
Anaccessorysupposes a principal offender. One who is neither the chiefactor in an offense, nor present at its performance, butaccedes to or becomesinvolved in its guilt, either by some previous or subsequent act, as ofinstigating,encouraging,aiding, orconcealing, etc., is anaccessory.
Anaccomplice is one whoparticipates in the commission of an offense, whether as principal oraccessory. Thus intreason, there are noabettors oraccessories, but all are held to be principals oraccomplices.
(supporter): Nowadays it usually refers to a reprehensible act that is supported.