I think maybe in the last 50 years, people have become more isolated from each other and the care factor has reduced somewhat, but really it's nothing new. People have always been horrible to each other. Just look at the way people were in mediaeval times - crowds would gather to watch someone be put to death, tortured, burned at the stake, punished etc, they relished it. Deep down, most people are capable of doing awful things to one another, there's a lot of psychological research that supports this.
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