It's more because of counters. I don't think that was even the main reason tinfoil hats became popular.
Although the demons could have made much better use of their portals. Emptying volcanoes onto cities isn't easy, but heaven later showed that a pile of rocks can do major damage, if you drop them from high enough.
I got the impression that heaven would have won had Lemuel actually thought they could, instead of figuring out how he could come out on top when they lose.
Tinfoil hats and air vents to blow away the pheromones, as I recall. But there's certainly some incompetence involved when the demons use highly outdated military intelligence in their choice of targets, resulting in a devastating attack on the Arsenal of Democracy.
As I recall, the justification for this in the story is that the demons are really long-lived, and human civilization has historically been very slow to change, so by demon standards decades-old intelligence on humans is recent and it's reasonable to expect that Detroit would still be a very imp...
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