Hitler was a waste. The strategic waste wasn't the Bismarck, it was Barbarossa, or more broadly, his war of conquest itself. Had the silly bastard not wanted to re-fight WWI and win, Germany would have wound up economically and politically dominating Eurasia and ultimately der veldt, orbiting astronauts by 1940, a lunar base by 1960, then on to Mars by the mid-1970s. The world (other than the victims of the Holocaust and the millions killed in combat or as its consequence) got off light.
The Soviets supposedly were selling him gas right up until the war.
But Stalin would have started something before England fell.
It wasn’t a question of if a rat bastard broke the peace between Germany and the USSR but which rat bastard did it first.
It was integral to his character to attempt to destroy the world, and himself in the process.