Their criteria is definitely “was this person/organization a bastard?” That said, the host does a lot of research and does attempt to provide as full a picture as possible about his subjects. There is some editorializing, and also there’s a healthy amount of “this is the best information that I could find”. A number of times I’ve heard him say things like “we don’t have a direct source for Thing X, so take this with a grain of salt”.

Well worth a listen imo, I ended up binging every episode over the course of a year or two.