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It would have been better as a possibly never-used threat, just to keep one side away. Threatening the Soviets with it wouldn't have caused much PR problems, but to threaten the West would have undermined the ideal way forward - the goal was to exist long enough in as much peace as possible as to let the word out about the miraculous solution to the jewish problem.

That's why they wanted to destroy Germany as soon as possible since 1933, just to prevent exactly that. Because the consequences would be world-wide actions taken against jews, namely removing them from powers of power, finance and influence.