The causes and effects of the second world war are too vast and complex to summarized in one tidy narrative, especially the modern one written by the winners of the war who espouse our greatest generation and ignore what an ugly, horrific conflict it was on both sides of the war.
As with any war among major powers in the world, the average person usually has very little understanding of why it came to be. So while the Holocaust was a noble reason to have this war, there were many other reasons why the various countries chose to be involved and many came late to the fray.
The causes and effects of World War II cannot be summarized in a single narrative. There was a lot going on back then and a lot of changes were happening at once. I think that everything that happened for a reason resulted in the ending of the war. I do not think it could be summarized in a single narrative.
No, the causes and effects of World War II should be summarized in a single narrative, because there were several things at play that all went wrong at once, the result of which was the worst war in world history. There were economic issues, racial issues, immigration issues, and other problems that are complicated.
All the events of the Second World War cannot be summarized in a single narrative. There were two theaters of the war, and there must be at least two narratives. To do justice to the story, there should properly be several narratives, for example, social, political, and economic causes and effects.