Wait so if the demons know that human blood is dangerous for them then, why do they have songs promoting eating humans?
Old propaganda is catchy, even if it's been proven wrong (especially if the general populous doesn't *know* it's wrong). Besides, most people don't actually know that humans are even real, so they might just assume it's a metaphor or something.
My headcannon is that the humans (atleast the rich and powerful) are also aware of demons existing and created sci-fi tech incase of a potential demon invasion.
Ameri 100% gonna go into an evil cycle when she finds out Iruma is getting deported