I felt like you do about MB before the letters were presented, but now I have no doubt that MB is deserving of the contempt that I and others may feel towards her, IMO. I also believe that she read every last word of both CN's letters to DM and vice versa, IMO. It just makes sense to me that she would because MB is way too involved with her adult son and his situation, and while I, as a mother, can and do feel empathy for mothers of those accused of a heinous crime, I cannot relate to MB's decision to alter evidence (colluding with CN to wipe prints from the trailer), remove items from Maplegate, assist her son with contacting CN against the DNC order, and all in all obstruct an active police investigation when TB was at the time considered to be potentially still alive but missing, IMO. Those actions are not the actions of a loving and protective mother operating on instinct, IMO, they are the actions of a complete control freak who IMO must have strongly suspected the guilt of her son, DM, and who was willing and able to use others to protect his and her own long-term interests, IMO.
All MOO.