There are several possible reasons for this. One reason could be that people are more likely to engage in risky behaviors when they are in a group, as they may feel a sense of anonymity and decreased personal responsibility. Additionally, group dynamics can lead to a phenomenon known as "groupthink," where individuals prioritize group consensus over individual judgment, leading to poor decision-making. Finally, peer pressure can play a significant role in encouraging risky behavior, as individuals may feel pressured to conform to the group's actions in order to fit in or gain acceptance.

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