I had to look it up. Posting just because. :-)
cas·u·ist Noun
1. A person who uses clever but unsound reasoning, esp. in relation to moral questions.
2. A person who resolves moral problems by the application of theoretical rules to particular instances.
ca·su·ist·ry noun plural ca·su·ist·ries
Definition of CASUISTRY
1: a resolving of specific cases of conscience, duty, or conduct through interpretation of ethical principles or religious doctrine
2: specious argument : rationalization
Me too ;)