Fruitful discourse in science or theology requires us to believe that within the contexts of normal discourse there are some true statements.
In the sense that you're not at the centre of power like a president or prime minister of a major power everyone is marginalised my position doesn't isn't unique in that respect. I think there are different sorts of relevance in different contexts.
I've done many different movies in many different contexts.
Testimony should be a philosophical problem and not limited to legal or historical contexts where it refers to the account of a witness who reports what he has seen.
Being a good Hans Haacke student part of his influence on me is that there's no difference between a gallery show and a film - or even an ad and a T-shirt-in terms of cultural legitimacy. They're just different contexts in which to have some sort of communication.