We want to read things that stimulate our emotions. That's why "happy-times" newspapers don't attract much of a following. They're too much of a good thing. Papers that scream unremitting death and destruction aren't that popular either. Too much of a bad thing. Most of us prefer a mix--teary heart-warmers side by side with the latest shocking scandal/blood-soaked murder/horrendous accident.
.And if you don't read a newspaper, the same applies to TV news.