Gopnik's bad faith extends to Richardson's biography, which he faults (unbelievably) for treating Picasso too kindly.
Gopnik thinks Richardson's biography treated Picasso too harshly. 
mnli hypothesis: Gopnik thinks Richardson's biography treated Picasso too harshly.  premise: Gopnik's bad faith extends to Richardson's biography, which he faults (unbelievably) for treating Picasso too kindly.