Humanity has gone a long way since the dark times, yet some chapters of our history have been blemished by human enemies. Serial murderers are one of the worst types of criminals that represent a serious threat to society. Serial murderers, by definition, are criminals who commit many killings at different times and locations for no apparent reason.
This cruel form of criminality is nothing new nowadays. Serial murdering has been around since the dawn of mankind. Serial killings are rare, accounting for fewer than 1% of all murder incidents each year, according to statistics. When they start out, however, they kill in large numbers.
Psychologists have been trying for a long time to determine the why some simple people can become serial killers and what pushes them to commit murders. But while any case is different from others, there are some factors that can influence one to do such horrific things, most times being intrinsic reasons that they believe to be strong and important.
Here are 7 of the most dangerous serial killers of all time.