Answer:
an illusion of invulnerability.
Step-by-step explanation:
Irving Janis who was a research psychologist has described eight symptoms of group-think:
1. Invulnerability.
2. Rationale.
3. Morality.
4. Stereotypes.
5. Pressure.
6. Self-censorship.
7. Illusion of Unanimity.
8. Mind Guards.
And, the illusion of invulnerability is one of the symptoms of group-think. It describes the over-confidence in the process of decision-making leads to form or create an illusion of invulnerability in which a person believes that he or she is invulnerable to any barrier or obstacle, allowing them to push or thrust aside analytical and clear thinking.