Cost certainly could be a factor. It seems it has in certain cases, Like Kyron Horman's. The state had to justify to the citizenry spending money on a search. In casey anthony's case, the money spent prosecuting her kept being brought up. But I did want to point out that according to national stats, violent crime rates are actually going down: http://www.fbi.gov/news/stories/2012/june/crimes_061112/crimes_061112 I think we have always had horrific crimes. (In fact, The Diary of Martha Ballard, written by a colonial woman, shows that is the case). We just have better news coverage and dissemination today.