I think that both of them had the same level of mistrust agains the authorities, the idea that what they were doing was correct when any person sound of mind would know a newborn baby with no medical checks, camping in the winter is madness. There we other options but from what we’ve seen, they were both as compliant as the other in their terrible plan.
“While the exact causes of SDD are unknown, the main two contributors are stress and social isolation.
[14]
People who are socially isolated together tend to become dependent on those they are with, leading to an inducers influence on those around them. Additionally, people developing shared delusional disorder do not have others reminding them that their delusions are either impossible or unlikely. As a result, treatment for shared delusional disorder includes those affected be removed from the inducer.
[15]”