The person who hires the hit man is worse because they are mad at someone for something and holding a grudge or a powerful emotion to harm or kill someone. The hit man kills for sport and just wants money he’s doing what he has to survive or following orders from someone who is more powerful and crazy than he is
The main psychological premise behind profiling is that there will be consistency between the way offenders act at the crime scene and who they are. ... Individual differentiation aims to establish differences between the behavioral actions of offenders and uses this to identify subgroups of crime scene types.
While very few studies (two, to be exact) have measured the impact of offender profiling in the field, several studies examined profiling's accuracy through other methods. ... Results of the famous “Coals to Newcastle” study found that the predictions made by profilers were accurate about 66% of the time
From how the both of them reacted I have a feeling Ava is older. If I'm correct Elijah still doesn't have much common sense and he would be confused on why taking more than one sample is an issue.