The blue dot is admitted to being a composite image by the guy who made it himself. It's not a real photo, none of them are.
Flat earth pilots exist, if there were none I would be more skeptical. I have hours of interviews, but I can seem to locate them online now. Here's an exceprt from the longer interview.
I think a good question would be what would you consider credible evidence that the earth isn't a curved ball flying through space?