"Our folks" in my belief, are no more or less intemperate or dogmatic, proportionatly, that the rest society. And it is, I'll agree, every bit as destructive within the group as it is within the larger society.
I really believe that some people, not all, have trouble getting along with others because they do not want to get along with others. Intolerance of ideas that are different from our own, maintaining attitudes, beliefs and practices that show others that others are less than oneself, are destructive practices.
If there really are mental illnesses, I would place racism, bigotry, intolerance and hatred among the diagnostic manual entries.
Our society doesn't look at things this way. If anything, much of what is done in this society and culture is based on prejudice, bigotry, intolerance, one-upmanship, egotism, greed, vanity and pride. Those who work in the so-called mental health system reflect these things in their daily actions.
Ultimately, some of those working in the field, believing in negative energies and forces, act and make decisions that adveresly affect others accordingly.
More sinisterly, the wrongs perpetuated in that MH system [and within Society in general] are made all the worse by truly evil individuals whose intent is more to be able to control others and of personally being in power. Such persons could care less about social justice, equity, equinamity, fairness, compassion, concern about human rights or spiritual growth.