"Reason and Emotion are a tag team in decision making in ethical domains. They do their best work together."

That statement is too strong. I can think of several instances where certain emotions, especially negative ones, can impair decision making. It is reasonable to assume that impaired decision making can extend into making ethical decisions.

The first page of the paper linked below provides a good summary of when emotions, and what emotions, can be helpful or harmful in making decisions. I do acknowledge that some emotions can be helpful in certain situations. Perhaps you should modify your statement.

http://www.cognitive-neuroscience.ro/pdf/11.%20Anxiety%20impairs%20decision-making.pdf