Yes, there was plenty of anti-nazi propaganda in WW2. It wasn't rational argument. It would have been more noble not to use any propaganda. So perhaps it's wron

Yes, there was plenty of anti-nazi propaganda in WW2. It wasn't rational argument. It would have been more noble not to use any propaganda. So perhaps it's wrong to use it. However, opinions forced on the public aren't all incorrect just because they're forced. Or for another example, there's anti-smoking propaganda. Changing people's minds by disgusting them with pictures of disease is manipulative, and I don't like it, but the general message that smoking is unhealthy remains true. This justifies nothing, but is a fact.