Honestly, I do not understand the need to create numerous horror films when there are enough terrific stories in the real life. If you want to get scared, you should just listen to the news or some crimes of the most famous maniacs. Human society, no matter how well developed and democratic it tends to be, always conceals all possible dangers and one of the most awful of them, unfortunately, is presented by people themselves.
Lois Garavito form Colombia is known for committing the largest amount of murders in the history of crime. He made children accompany him using candies and other means of attraction and then he held them in the captivity, tortured and raped them and finally slashed their throat which explains why most of the victims were found headless. Garavito was captured in 1999 and found guilty in committing 138 murders, though he is said to commit 172 crimes. However, the law of Colombia allows sentencing a criminal for no more than 30 years of imprisonment. As Garavito helped the investigation, his sentence was reduced to 22 years.