You seem to be having trouble with how you parse information, so let me help you. As I'm town, I have info that directly correlates to Mango being scum. Not indie, scum. If someone thinks I'm town, then they trust my testimony. So Mango further burying himself means nothing to them or to me. Because he's outed scum. You can't be more outed than outed scum. Him claiming Indie only affects those who either side with him, or are undecided - it potentially sways them to supporting his side because he has no kills as an Indie. So with all that considered, your argument of "you shouldn't care because it just exposes him further" doesn't stand up - from my perspective, the only outcome from him claiming Indie is a negative one.