Editing Murder (section)

== Contributing factors ==
According to Peter Morrall, the motivations for murder fit into the following four categories:<ref name="Morrall-2007">{{Cite journal|last=Morrall|first=Peter|date=2007|title=Murder and society: why commit murder?|url=https://www.crimeandjustice.org.uk/sites/crimeandjustice.org.uk/files/09627250608553401.pdf|url-status=live|archive-url=https://web.archive.org/web/20200724174005/https://www.crimeandjustice.org.uk/sites/crimeandjustice.org.uk/files/09627250608553401.pdf|archive-date=2020-07-24|journal=[[Centre for Crime and Justice Studies]]}}</ref>

* ''[[Crime of passion|Lust]]:'' The murderer seeks to kill rivals to obtain objects of their sexual desire
* ''[[Euthanasia|Love]]:'' The murderer seeks to "[[mercy kill]]" a loved one with a major deformity or an incurable illness.
* ''[[Hatred|Loathing]]:'' The murderer seeks to kill a loathed person (such as an abusive parent) or members of a loathed group or culture.
* ''[[Treasure|Loot]]:'' The murderer seeks some form of financial gain.

Morall takes a biological view of offending when he insists the risk factors that may increase the chance that somebody will commit a murder include:<ref name="Morrall-2007" />

* [[Testosterone]], the primary male sex hormone, is correlated with competitive and assertive behaviour.
* Reduction in [[serotonin]] increases likelihood of impulsive hostile behaviour.
* Alteration in the [[Glycolysis|breakdown of glucose]] appears to affect mood and behaviour.
* [[Hyperglycemia]] and [[hypoglycemia]] can both lead to aggression.
* [[Consumption of alcohol]] can lead to reduced self control.
* [[Environmental pollutants]] circulating in the body are linked to heightened aggression.
* [[Malnutrition]] from eating too much [[junk food]] can provoke aggressive behaviour and even murder.

Certain [[personality disorder]]s are associated with an increased homicide rate, most notably narcissistic, anti-social, and histrionic personality disorders and those associated with psychopathology.<ref>{{cite book |last1=Petherick |first1=Wayne |title=Homicide |date=2018 |location=London, United Kingdom |isbn=9780128125298 |pages=62–65}}</ref>

Several studies have shown that there is a correlation between murder rates and [[poverty]].<ref>{{cite journal |last1=Dong |first1=Baomin |last2=Egger |first2=Peter H. |last3=Guo |first3=Yibei |title=Is poverty the mother of crime? Evidence from homicide rates in China |journal=PLOS ONE |date=18 May 2020 |volume=15 |issue=5 |pages=e0233034 |doi=10.1371/journal.pone.0233034 |pmid=32422646 |pmc=7234816 |bibcode=2020PLoSO..1533034D |doi-access=free }}</ref><ref>{{cite journal |last1=Bailey |first1=William C. |title=Poverty, Inequality, and City Homicide Rates. Some Not So Unexpected Findings |journal=Criminology |date=November 1984 |volume=22 |issue=4 |pages=531–550 |doi=10.1111/j.1745-9125.1984.tb00314.x |url=https://engagedscholarship.csuohio.edu/clsoc_crim_facpub/31 }}</ref><ref>{{cite journal |last1=Suhail |first1=Kausar |last2=Javed |first2=Fareha |title=Psychosocial causes of the crime of murder in Pakistan |journal=Pakistan Journal of Psychological Research |date=Winter 2004 |pages=161–174 |id={{ProQuest|89070703}} |url=https://www.pjprnip.edu.pk/index.php/pjpr/article/view/226 }}</ref><ref name="Barata-2000">{{cite journal |last1=Barata |first1=Rita Barradas |last2=Ribeiro |first2=Manoel Carlos Sampaio de Almeida |title=Relação entre homicídios e indicadores econômicos em São Paulo, Brasil, 1996 |trans-title=Correlation between homicide rates and economic indicators in São Paulo, Brazil, 1996 |language=pt |journal=Revista Panamericana de Salud Pública |date=February 2000 |volume=7 |issue=2 |pages=118–124 |doi=10.1590/s1020-49892000000200008 |pmid=10748663 |doi-access=free }}</ref> A 2000 study showed that regions of the state of [[São Paulo (state)|São Paulo]] in Brazil with lower income also had higher rates of murder.<ref name="Barata-2000" />