Here:
Germany would not have wanted revenge if they were given a just peace so there would be no need to fight again. This is because Hitler used the feeling of nationalism in order to influence the Germans to think they were mistreated and that they deserve better, this originated the idea that Germany must be above everything, a common consequence of exaggerated nationalism.
Hitler's promises would not have as much power because they would not have been as powerful. Without the feeling of mistreatment it would not have been easy for Hitler to influence and manipulate the Germans.
Germany not being punished in the war would have made the Nazi party more of a fringe party. Again, this is because it would not gain much power, they appealed to the feeling that led to nationalism as an ideology to gain power and control.
Hope this helps!!!
~BBGLUVER