This shit has seriously gone on too long. People who continue to cling to the "10,000 dead crushed by tanks hosed i to the gutter" bs are cranks. It's jews control the banks, chemtrails, the earth is flat, the moon isn't real level of crank shit and unless you're feeling very indulgent and someone is asking in good faith it can be dismissed as equally serious to that kind of crank shit.
Yeah, I don't think psychosis fits, because it's a propaganda thing not an individual loss of connection with reality, but I don't know what better term there is. Cultural delusion? It's wild.