Which is why people cannot determine killers at a young age. They have, however, found similarities between most killers brains. To begin with, many killers share what is known as the “warrior” gene. This gene is said to regulate neurotransmitters that controls someone’s impulse. Individuals that are known to have this gene are seen to be more aggressive and are more likely to react in certain situations. Although the warrior gene is found in a lot of convicted murderers, it is also found in a lot of normal people. Which leads to the argument of killers being made through nurture because of environmental factors. Kids who are often neglected and mistreated usually acquire a lot of hate and become very violent. There have been some instances in which a kid is mistreated and like to take that anger out when something reminds them of a situation they encountered as a young