Would crime rate decrease if the media decreased reporting bad news?

No it wouldn't. Also, if the media stopped reporting on a lot of crime, there would be no incentive for politicians and police departments to increase their budgets or their enforcement. Then there is the issue of trust. Not all crime is reported. I'm sure we have all witnessed an accident or actual crime but see nothing about it on TV or in the paper. The media is selective, and tries to put out the most eye catching story they can. However, the public needs to know is there a crime wave happening, what is the cause, and what is being done about it.