How do perpetrators of great violence against the members of other groups justify their actions?

Perpetrators of great violence against members of other groups often justify their actions through various means. Some may use religious or ideological beliefs to rationalize their behavior, claiming that they are carrying out the will of a higher power or working towards a greater cause. Others may dehumanize the members of the targeted group, portraying them as inferior or dangerous in order to justify their violent actions. Additionally, some perpetrators may cite historical grievances or perceived injustices as justification for their violence, believing that they are seeking retribution or justice for past wrongs. Ultimately, the justifications for such violence are often rooted in prejudice, hatred, and a desire for power and control over others.