The fallacy in the Broken Window Fallacy is that it ignores innovation. WWII was like breaking all the windows in the city, then gearing up to make windows 10 times better at half the price. And not just the windows.
Nonsense. If as a result of innovation, it makes economic sense to replace an old window with a better one, people will make that decision on their own.
If it doesn't make economic sense to replace an old window with a new one, then those resources are better spent on something else.