Reply #1: Stages of Genocide and How To Prevent It (Wikipedia)

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According to President of Genocide Watch Gregory Stanton, genocide develops in eight stages that are "predictable but not inexorable":

Stage Characteristics Preventive measures
1.
Classification People are divided into "us and them". "The main preventive measure at this early stage is to develop universalistic institutions that transcend... divisions."
2.
Symbolization "When combined with hatred, symbols may be forced upon unwilling members of pariah groups..." "To combat symbolization, hate symbols can be legally forbidden… as can hate speech".
3.
Dehumanization "Dehumanization overcomes the normal human revulsion against murder." "Hate propaganda should be banned, hate crimes and atrocities should be promptly punished."
4.
Organization "Genocide is always organized... Special army units or militias are often trained and armed..." "To combat this stage, membership in these militias should be outlawed."
5.
Polarization "Hate groups broadcast polarizing propaganda..." "Prevention may mean security protection for moderate leaders or assistance to human rights groups..."
6.
Identification "Victims are identified and separated out because of their ethnic or religious identity..." "At this stage, a Genocide Alert must be called..."
7.
Extermination "It is "extermination" to the killers because they do not believe their victims to be fully human." "At this stage, only rapid and overwhelming armed intervention can stop genocide. Real safe areas or refugee escape corridors should be established with heavily armed international protection."
8.
Denial "The perpetrators... deny that they committed any crimes..." "The response to denial is punishment by an international tribunal or national courts."

http://en.wikipedia.org/wiki/Genocide#Stages_of_genocide_and_efforts_to_prevent_it