The natural variant is genetic, and represents a real deficiency. The acquired variant is a set of behavioral patterns. The cure lies in some combinations of art, spirituality, or philosophy.
yes and no….
theoretically, every condition has genetic predispositions and environmental influence…..each individual is different…..for example, in medical illness, some people smoke and eat whatever they want and do not develop lung cancer or diabetes, some people are very “fit” and still develop heart disease, cancer and/or diabetes, etc…..in psychiatric disorders, it is the same thing….some people can weather major emotional trauma and be fine, others, without “reason”, develop psychiatric illness….taking family history (genetic load) into consideration, each person may have a “tipping point” in which a “sub clinical” condition begins to present clinical symptoms, thus becoming a disorder…..
in anti-social personality disorder (the currently accepted term for sociopathy or psychopathy), there may also be genetic and environmental factors, but once the symptoms present, the condition is not easily treatable (and I am being “diplomatically optimistic”

….although it is certainly possible that those with greater environmental loads may be more likely to respond to treatment, it is really hard to tell with these types…..more likely, as u said, the sociopath just “acts” less sociopathic in certain instances…..
although controversial, sociopaths “supposedly” do better/well in areas that are very highly structured/have many rules, such as sports, law enforcement/military, very structured religions and jail of course…..the thought behind that is that the more sociopathic, the more you need “external” controls, as opposed to developing an “internal” moral/ethical code
What is a "major disorder", exactly?
sorry, it's just terminology, not "severity"....in the behavioral sciences, each individual recieves a 5 "axis" diagnosis, axis 1 is "major psychiatric illness", axis 2 is developmental and personality disorders, axis three is physical conditions, axis 4 is environmental stressors, graded from none to catastrophic and axis 5 is a "global assessment of function" GAF, which is ranked from 100 (above average) to 10 ("hannibal lecter")...a "0" is inadequate information