As some people can be affected by events in which they themselves have not personally experienced, they could have someone they truly care about having a particular event happen to them. Suppose that your wife, husband, a family member, or even a close friend goes to war and you are home waiting for them to return home safe and sound. During that time in which they are away and out of contact, you are continuously worrying about their safety and well being.
In some way or another, I personally believe that the way an event affects a person has all to do with a psychological way of thinking. Even though you yourself aren't there experiencing the event, you get the sense of knowing exactly what is happening. Also, you might get a feeling of anger, not towards someone else, but towards yourself for not being able to be there to support the cause. For instance, at this very moment in time, we have but hundreds of soldiers over in Afghanistan searching for the Taliban and Osama Bin-Laden. And many Americans wish that they could be there to aid the cause, but many cannot because they have families to care for.
Although some of us cannot help, but can only watch what is happening around us, we try to see things of how they could be different instead of how they really are. Consequently making all of our worrying and sorrow insignificant, and we let it affect the way we live our lives. Therefore, people can be affected by such events that are not happening to them but by persistently worrying about the well being of others, while in reality it affects the way the person acts and lives.
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