I just took it as poetic, not that bulldozers are actually a problem. Innocent-looking machine can be used for grotesque things, which is creepier in a way than

I just took it as poetic, not that bulldozers are actually a problem. Innocent-looking machine can be used for grotesque things, which is creepier in a way than regular weapons. That's about it. Idk if that's what the author intended.