Well I teach English to a 70-year old Jewish lady, both of whose grandfathers died in concentration camps, and she's as fit as a fiddle and bright as a button. How many people whose ancestors suffered trauma are not chronically ill? How does the incidence of chronic illness of people whose ancestors suffered trauma differ from those whose ancestors inhabited a bucolic paradise on earth? Is there any difference? The burden of proof is on Ms. Mead, so she'd better start printing some questionnaires for a study to gather evidence in time honoured BPS fashion.