Sensationalism gets people's attention, and since deregulation and the consolidation of so many news sources into huge multinationals like Disney and Time/Warner, the mainstream news has become about making money rather than engaging in real journalism for the public good.
One might naturally assume from the above that if the US media are solely concerned with profit rather than real journalism (full news reportage) that people cannot trust information they are fed. For example, how can you be certain that violent crime is as low as you say if your source if information is the media? Are you and others aware of what is happening in Guantanamo? Are you aware of the damage the Bush administration has done to our nation's reputation abroad?