Right or Wrong?

How do we determine whether committing a crime is a justified act? Does committing a crime out of revenge or being wronged constitute as an acceptable excuse? In Greek society, women were perceived as inferior to men and were possessed as property. Women obtained no power against men, thus they were forced to live under male control. Clytaemestra committed the crime of murder out of hate and vengeance towards her husband who sacrificed his daughter for his own personal gain and well being. In addition, when Agamemnon killed their daughter, no justice was to be served due to the fact that males dominated Greek society and women did not have the ability to act when a wrongdoing was committed. So this brings us to the question of what violent crimes are justified in Greek and modern society? Certainly, in modern society, if an individual murders another human being out of vengance, their actions are commonly not justified. For example, in current news, if a Palestinan man murders an American soldier because he killed the man's relative is that act justified? Where do we draw the line for crimes? Personally, I feel that if an individual murders another human being, despite their mental state, they are committing a wrongdoing in which they are well aware of the possible consequences. In the United States, there is a general concensus that the act of murder is immoral, yet in other countries, murder is an acceptable form of justice. My question is, how do we draw the line?