Yeah, in the process of killing millions and all imaginable crimes against humanity, they did a few good things, no one denies that. But if you use those good things as your argument, that's known as the broken window fallacy.
This has to be the most bizarre interpretation of the broken window fallacy I've read.
Actually it's very common. Try arguing with a soldier. Those guys are brainwashed into believing that the military helped humanity move forward technologically, as if spending that money directly in research (without the bombings, the deaths of millions, etc.) couldn't possibly have achieved the same, let alone much more (which is in fact more likely).