Brain injury

To my mind, a person who genuinely "can't stop drinking" is almost as miraculous as a dead man restored to life. 

Long time alcoholics have fouled brains, they don't work, like meth heads have a hole.  So Bryan Caplan likely has no clue, and neither do many psychologists.   After the death, the damage from alcohol is apparent.

At autopsy, individuals with ARBD have reduced brain weights and their degree of atrophy correlates with lifetime consumption (Harding et al. 1996). Brain shrinkage (atrophy) is regionally specific but mainly occurs in the frontal lobes. ARBD is a neurodegenerative disease but atrophy and is largely due to white matter (WM) loss (Kril et al. 1997). 

ARBG - alcohol related brain disease. 
The point is, Bryan says something about an unobservable injury, he would have no clue. Neither do I, but I wouldn't make the claim.