Maybe one day science can answer that question. Better yet, maybe one day science can come up with solutions to help those who struggle with drinking. There is ongoing research on addictions....alcohol addiction is a HUGE health problem in the U.S. and, I suspect, many other countries. AA and other recovery programs don't work for many people. It's just ludicrous how behind the medical technology is for alcohol/drug addiction considering the toll it takes on people and society.