Social cleansing
In certain societies there are groups of people, who think that certain people should not be part of that society. These people who are seen as "undesirable" are then either killed, or they are driven away. This is known as social cleansing.  Examples of such groups seen as undesirable are homeless people, street children, criminals,the elderly, and people with disabilities. Very often, these ideas also touch sex workers, people who are homosexual, or who have a gender identity outside the clearly defined male, or clearly defined female spectrum. Wanting to do social cleansing is caused by a combination of economic and social factors, but killings are mostly present in regions with high levels of poverty or were there are very few very rich, and the rest of the poulation is poor. Perpetrators are usually of the same community as the victims. Very often, they think that the victims are a drain on the resources of society. Efforts by national and local governments to stop these killings have been largely ineffective. The government and police forces are often involved in the killings, especially in South America.