All these skills are needed for good decision making, and the chance of a single person possessing them all is less than the chance of a group possessing them. Also, you can make more monumental decisions in groups, because you know you won't be singled out for blame. Can hide, basically, from personal responsibilility. Not all groups make good decisions. However, groups, however, don't always make good decisions.
Juries sometimes render verdicts that run counter to the evidence presented.
Community groups take radical stances on issues before thinking through all the ramifications. Persuasive arguments theory 2. Social comparison theory 3. C. Symptoms 1. Biased perceptions 3.