There is no "evolutionary advantage" to having a broken bone, but there is clearly an advantage (in certain environments) to numbing your emotions, or being codependent; interpreting patterns; vigilant suspicion; risk-taking; multi-tasking; violent aggression; or attraction to and hyper-focus on repetitive tasks. Instead of "mental illnesses," we should speak of "mental strategies." Mental illnesses can only describe genuine defects with no theoretical advantage (Down's Syndrome, for instance, although I would love to hear a theory of how it might confer an advantage).

99% of things labeled "mental illnesses" are just "inappropriate strategies for the present median context." It would be like drowning someone underwater, or holding a fish above water, and declaring that the first has a "gills illness," and the second has a "lungs illness." No — this is not an illness, this is an evolutionary strategy removed from its locus of proper application. Great article.