stressful living in USA?

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On the recent news,many shootings involved in school, home, workplaces and even military base now. What is going on within USA nowadays? Are people under too much stress, and too much pressure from their surroundings and environment? Psychologically, they couldn't handle it no more, pick up a hand gun, and run a wild shooting rampage against whatever you hate the most. It become one of the dangerous ground for our citizens here. Don' you scare you might involve in such incident?