This question is very general and impossible to answer comprehensively.
这个问题太综合了，不太可能全面完整的回答。
The answer quite often is because of other people - something social psychologists have comprehensively shown.
通常我们会听到的答案是：是由于外人造成的(一些社会心理学家笼统的这样解释。)
The answer quite often is because of other people - something social psychologists have comprehensively shown.
通常我们会听到的答案是：是由于外人造成的(一些社会心理学家笼统的这样解释。)
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