Not really propaganda. It's real reaction from large portion of people. But the belief of mass is not always right.
Iraq was destroyed not only because of WMD as a lie but the biggest factor is that Westners as human rights activits collectively supported their government based on the belief that they own truth and have "moral responsibilty" meaning they are the judge but not god to decide other peoples fate by liberate them from evil human right abuser i.e. Saddam and Gaddafi. They are able to do that because western countries have more bombs while the "evils" can not defend themselves.
In today's world, Hitler doesn't create threat because it's obvious wrong and will be easily destroyed. The real threat is mobs of human activists that believe they stand on a high moral ground. They are more deceptive. They create chaos around the world. They show no remorse for the suffer of Iraq and Libya people because they don't think they cause the disaster.
Blaming the lie of WMD is another lie. The Western people collectively supported their countries to bomb Iraq and Libya that evetually created the chaos and disaster. That's the real root cause.
Human rights and democracy is the last cult in the world after communism collapse. I'm not saying HR and democracy themselvs are bad. But because the believers have done a lot of damages without knowing it's their crime that cause millions of death. The stupidity of mordem human only recognizes direct killing as a crime but never admit bigger scale crime indirectly caused by their "good" intention