Molly does try to spend her money on worthy social causes. The trips eased a peculiar sense of placelessness. So she sets out for places like China, Nigeria, El Salvador, and, eventually, Algeria. The great tragedy of Molly's life was her journalist brother Harry's death in El Salvador in 1981. There is no clear explanation as to how he died, and a variety of theories are offered up.
Nothing is black or white, only various shadings of grey.
Oh yeah, it's an ambiguous world out there. After Greene's death, when their correspondence is finished, Molly is moved again to do something good. It is an homage to both Greene, and to her brother, murdered a decade earlier. She speaks French, and she figures that by donating some money for bodyguards or dogs she would be able to help protect vulnerable local writers and journalists. The two American women and the Brit are naifs, protected only by their innocence.