If the pursuit of happiness was once an ideal in American life, the entitlement to happiness may now have replaced it. Since the late 1980s, when psychotropic drugs first came on the market, grateful Americans have been lining up at the counter. Prozac, Zoloft, Paxil, Wellbutrin and a host of other antidepressants have been embraced as practical solutions to everyday unhappiness. More than 15% of Americans now use one of the above. Needless to say, they are not all clinically depressed. Whereas Sigmund Freud once described the goal of psychotherapy as "transforming hysterical misery into ordinary unhappiness," many doctors now...