DR. KRAUTHAMMER IS IN. Some of his readers may not have heard that Charles Krauthammer was trained as--and for a while functioned as--a psychiatrist. Thus he can be excused for this lapse, in today's Washington Post column, into the "genetic fallacy." However, if Dean's accusations are not due to mental derangement they must be due to tertiary cynicism which is, for a presidential aspirant, possibly worse but, of course, not without precedent.