They go after those victims who are totally unknown to the darker side of this big black hole of huge business like selling a life for just some money gold coins and even murder them so badly that those dead bodies get rotten and shedded bodies pieces shattered everywhere in the dust bin gutters and even buried underground.The serial killers don't aim small and go slow they attack big hand on keeping the eye closely to his or her all the time and notify all the routine with wider brain power and plot and jot down points with sharp edges without making making any flaws and mistakes. In the past many serial killers types were common some attack old , children and even prostitutes buz the reason is why they sell their bodies for money and fun.Some are physco pats who just enjoy cutting and cringing his preys