Why people are reluctant to help for strangers?

           I think that the reason why people are reluctant to help is that they fear that they will be asked to give additional help after the initial request. It’s common that strangers will ask extra help after people answer the easy questions, such as time, weather, and so on. Strangers just want a chance to contact people sometimes. In other words, they try to catch people’s attentions by easy questions. If people answered the questions and talked to strangers more times, they would probably reduce their vigilance. Then, people may be difficult to reject stranger’s requirements. Based on the situation, people sometimes are not willing to answer the stranger’s questions even though the question is simply and easy to answer. They don’t want to answer questions because they’re afraid to being stranded in this embarrassing situation. It’s just a simply way to protect themselves in the society.