As far as I am aware, the New Republic wins the Battle of Jakku and is then able to sign a peace treaty with the Galactic Empire. This is called the Galactic Concordance and involves the Empire disarming. Some extremists go off into the Unknown Regions and found the First Order. Okay, correct me if I am wrong in this, but the Empire are Nazis in space? So it is reasonable to assume that the fall of the Empire would play out in much the same manner as the fall of Nazi Germany and people would react to them in the same way. So if you look at what happened to Nazi Germany: - Unconditional surrender. The entire country occupied and divided between the Allies. - The Nazi Party is banned. Its members and senior military figures arrested, thrown in prison or outright executed. Israel conducts a campaign of assassination against those who try to escape this. - The entire Nazi state is dismantled. German militarism is actively and consciously suppressed with great effort made to encourage a move towards pacifism and neutrality. - Great effort is made to publicise the crimes of the Nazi state. This is something which exists even today. People around the world are essentially taught in school to remind them how evil the Nazi's were. Now, compare this to Star Wars: - The New Republic offers a generous truce that allows the Empire to retain much of the core and inner rim. This is an obscenely generous offer since it means the rebels will have failed to liberate the galaxy from Imperial rule. They even allow the formation of a successor state to go unpunished. - As per the above, the Imperial State is not dismantled. - No Imperials are punished for their crimes. No attempt is made to pursue General Hux the Elder and the other Imperials into the Unknown Regions. Essentially every Imperial is pardoned regardless of their complicity in an illegitimate totalitarian regime that committed genocide. Now, a few people might be saying "but the Empire isn't anywhere near as evil, so the Republic was simply being proportionate in its response". This doesn't add up. * The Empire committed genocide on Alderaan with the Death Star and intended to use these weapons for that purpose. It is reasonable to infer from this that they use more "traditional" methods of repression such as the gulag and death camps. This is especially true considering that they enslave and massacre non human species, but it would also apply to political dissidents, prisoners of war and the like. * Such crimes are magnified by the fact that before the Empire the galaxy knew 1000 years of peace under the democratic republic. * They are being led by a Dark Lord of the Sith. If you look at the supernatural nature of Star Wars, this makes the Empire and all those who serve it comparable to Orcs from Lord of the Rings in that they are servants tied to an unnatural force that represents chaos and evil incarnate. Destroy the Sith and by extension the Empire and you restore balance. So by extension, killing every Imperial is a just and righteous thing to do. Basically showing forgiveness towards these people would be deemed immoral. I am sure the Republic would give them a trial, but if you're an officer or member of the Imperial State then you are either spending a lifetime in jail or getting hanged.