There are those that not only believe that their government, along with other governments around the world, would lie to them but who also have the evidence to back it up. This is then not going to be something that has just happened once; it will be something that takes place on a regular basis.
Someone like this could talk about what has happened in the past, laying down a number of instances when this has happened. In addition to talking about when this has taken place in their country; they can give examples of when this has happened in other countries.
A Mixed Response
If they were to speak freely about what they know, they are likely to find there are at least three types of people. Firstly, there are those that agree with them, secondly, those that are unsure, and thirdly, those that completely dismiss what they have to say.