Why do people concentrate on the negative? I mean look at news, its all about bad stuff. Talk radio is anitgay

When you do see a happy story its one of kids painting an angel picture on the sidewalk, or a fireman saves a kitten. There are thousands of good untold stories of good people doing good things for each other out there every day, yet media concentrates on the negative. And to make it worse, the negative that seems to be neglected is anything LGBT related until someone gets killed. I don't understand media. What do you think?