What are the first three ethical/dialogical dispositions of a critical thinker, and what does each guard against?

Courage, respect for the other's dignity, and fairness/impartiality — each counters a specific way that dialogue goes wrong.

These are other-regarding virtues: they govern how you reason with people, not just inside your own head.

• Courage (Mut) — the willingness to face that your own convictions might be wrong, and to stand alone with a justified belief when the group disagrees (the antidote to groupthink). It carries an existentialist edge: taking responsibility for our choices is unavoidable, and there's no pre-given order — our life is what we make of it.
• Respect for the other's dignity — collaboration over competition. Convictions (especially moral values) sit deep and are woven into identity, so "practical wisdom" means arguing without trampling the other person. Crucially: a bad or irrational argument is not proof that someone is cognitively inferior.
• Fairness / "moral point of view" / impartiality — checking whether you're impartial or driven by self-interest: Is my claim universalisable? Is there a conflict of interest distorting my argument? Do I represent others' positions charitably (in their strongest form)?

Tip: Courage protects against the group, respect protects against contempt, fairness protects against your own self-interest. Together they keep a disagreement honest.