I am not sure that this is a helpful definition. There are many opinions that could be described as "paranoid delusion" by its opponents but still have a high

I am not sure that this is a helpful definition. There are many opinions that could be described as "paranoid delusion" by its opponents but still have a high probability to be true. For example many politics from Eastern Europe tried to warn their Western colleagues (before 2008) that Russia is not up for good relations with EU. This was labeled as Russophobia i.e. paranoid delusion. Trying to understand global politics is a very difficult task and there are probably many false beliefs even on highest level. It is also up to interpretation.