Rationality and emotion may seem antithetic. One is objective and relies on mental models, while the other is subjective and relies on gut feelings.
When it comes to making decisions, we tend to favor the formal process of rationality over the impulse of our emotions.
However, it is foolish to think all of our decisions are purely rational. That is not to say taking emotions into account when making a decision is irrational: emotions are actually incredibly useful tools when yielded with care.