Journalist Lincoln Steffens proved that he could create a crime wave anytime he wanted by simply writing about all the crimes that normally occur in a large city during the course of a month. He could also end the crime wave by not writing about them.
Besides, murders, (or regress) of a society. Why are there so few TV stories about symphonies that have been composed, novels written, scientific problem solved? -> were TV news to be filled with these events, we would not be frightened. We would, in fact, be inspired, optimistic, cheerful.
One answer: these events make poor TV news because there is so little to show about them.