We want to distinguish between the role of oxytocin as regulator in (general) stress and pain (meaning that when there is a sense of social safety present, other stress is modulated by oxytocin - like in giving birth), and the decrease of oxytocin levels through the lack of social safety (which is a specific social stress).
As stated above, "__decrease in secretion of oxytocin by special social stress__ leads to low stress tolerance,..."

Moreover, social stress in early childhood primes the system to produce less oxytocin:
"It has been observed that experiencing childhood trauma, which is a major predisposing factor for the development of insecure attachment and mental health problems, may dysregulate functioning of the oxytocin system. For example, it was shown that adult women who were exposed to any form of childhood maltreatment had lower oxytocin levels in the cerebrospinal fluid compared to controls (Heim et al., 2009). "

Oxytocin plays an interesting role in hateful behaviour as well, referring to our tribal perception - its empathy builds upon a base of safety and belonging, upon a “we” that has already been established - thus a hormone that can also support polarization and counteract tolerance in a society where a part is being ostracised. 

Perhaps we can formulate these roles more clearly - open to suggestions.