现在人比过去体验到焦虑5到8倍？

The Self-Driven Child - William Stixrud & Ned Johnson （中文版译名：《自驱型成长》）

From 1960 until 2002, high school and college students have steadily reported lower and lower levels of internal locus of control (the belief that they can control their own destiny) and higher levels of external locus of control (the belief that their destiny is determined by external forces). This change has been associated with an increased vulnerability to anxiety and depression. In fact, adolescents and young adults today are five to eight times more likely to experience the symptoms of an anxiety disorder than young people were at earlier times, including during the Great Depression, World War II, and the cold war. Are things really harder now than they were during the Depression? Or are we doing something that is dampening their natural coping mechanisms?

这本书里说了一个有趣的观点，在过去几十年里，青少年自我控制力变得越来越差，越来越依赖外部控制。这种变化导致更易受到焦虑和沮丧的困扰。事实上，当今青少年比过去更容易体验到焦虑——是过去的5到8倍。“过去”包括大萧条、二战以及冷战。是我们现在比大萧条时期更困难？还是现在人处理（危机）的能力受潮了？

大家怎么看这个观点呢？