ABSTRAK
Suatu tindakan agresi dapat diterima dan dibiarkan oleh individu karenadipersepsi legitim. Studi ini hendak menguji hipotesis bahwa keterancaman sistemmempengaruhi persepsi legitimasi suatu tindakan agresi. Menurut systemjustification theory, setiap individu berupaya untuk membela dan memberipembenaran terhadap sistem di mana ia menjadi bagiannya, khususnya ketikasistem berada dalam keterancaman (system threat). Melalui metode eksperimen,keterancaman ini diuji pada dua domain: sistem sosiopolitik dan sistem agama.Dalam studi 1, keterancaman sistem sosiopolitik pada partisipanmahasiswa tidak memberi efek yang signifikan terhadap persepsi legitimasiperilaku agresi. Begitu pula halnya pada studi 2, tidak efek dari keterancamansistem agama eterhadap persepsi legitimasi agresi pada partisipan mahasiswa yangdiberi kondisis keterancaman tinggi. Meski tidak didapatkan perbedaan nilai yangsignifikan antara persepsi legitimasi agresi dalam kondisi keterancaman tinggi danketerancaman rendah, ada interaksi pada domain agama.

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ABSTRACT
An act of aggression is acceptable and tolerated because people perceive itlegitimate. This study test hypothesis that system threat effects on perceivedlegitimacy of aggression. According to system justification theory, everyindividual seeks to defend and justify their system, especially when the system isunder threat. Through experimental methods, system threat tested on twodomains: socio-political systems and religious systems.In study 1, high threat exposure on socio-political systems have nosignificant effect on the perception of the legitimacy of aggressive behavior.Similarly, in study 2, no effect of system threat on perceived legitimacy ofaggression to participants who were given high threat condition on their religioussystem. Although no significant effect were proven statistically from the twoexperiments, we found there were slight interaction between system threat and itseffect on perceived legitimacy of aggression for religion domain.