A group of chemists, who have been working together on a new diet pill for the last four years, met to discuss their new drug. Over the years, they have all come to respect each other and have formed a close bond. Upon discussing the effectiveness and safety of the diet pill, many members of the group found themselves agreeing with most of the comments that were made. Somewhere along the way, no one seemed to pay much attention to the fact that some of the subjects in the clinical trials of that drug became ill. It seemed that because nobody wanted to disrespect anyone else, the topic of ill subjects was dropped. What psychological phenomenon occurred here?