Answer: Increase pluralistic ignorance,
Less likely to assume it's an emergency situation
Explanation: Given that most of the guests at the coffee shop were left uninterested and ignored the squeaking of the brakes, it may be true that Gillian would assume that there was no cause for alarm. There may have been a need for an emergency, without going into whether the cafe guests are right or just don't care, but the point is that majority of people create public opinion and conclusions are usually made in the crowd based on the reaction of the majority.