Claiming that the Soviet Union was a major force in the re-arming and preparation of Nazi Germany is counterfactual at best. There are hundreds of studies on how and why Nazism rose in Germany, and none seriously posits that it was with the help of the Soviet Union (the aftermath of WWI, the treaty of Versailles, rising discontent and anti-semitism, are all part of the real motives). Because of the tenets of Nazism, the war in Europe would have been fought no matter what ("living space", "superiority of the Aryan race", "final solution of the Jewish question" and all that stuff). Without the Soviet Union, Nazi Germany wouldn't have had a major front in which their soldiers fought and died by the thousands, and it would have made the job of the Western Allies incredibly harder, if at all possible.

If you want to assign blame to other countries, many businessmen in the Western world actually saw Hitler in a positive light, at least initially, since he was against unions and workers rights.