How does personality theory affect ethics?

In your 21 December 2014 discussion of the relationship between philosophy and science, you stated that your grasp of personality theory has given you a fresh perspective on ethics and changed your understanding of the requirements of the virtues. How does personality theory inform the field of ethics, in general? How should personality theory inform our moral judgments? How does one avoid slipping into subjectivism when accounting for personality differences? (Presumably, it doesn't matter whether Hitler was a High-D or not before we judge him as evil.) How can we distinguish between making reasonable accommodations for personality differences and appeasing destructive behavior and people? Do signs of honesty or dishonesty vary between personality types? Are virtues other than justice affected by an understanding of personality theory?