Rationalizer

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A rationaliser is a headmate who helps their system rationalise. They might front and argue, relativise, or otherwise steer the system into a direction they view as more rational. They might aim to promote critical thinking, or avoid overthinking or irrational decisions of other members.

Related Terms
Negotiators and moderators seek to settle disputes, especially if other members cannot find a compromise in the current conflict. This may be considered one involvement in rational action.

If the system feels that their irrationality is caused or influenced by emotion, a rationaliser may also be a cassmate.