Annhauser-Bush, Seagrams, Bayer, and the AMA don't like competition or loss of control and profits from their oligarchy.
Most of the ills you speak of are also created by folks that are addicted to alcohol. The remaining societal consequences are created by the stuff only being available on the black market, unless you have the coin and contacts in the medical community to get a prescription.
Nonsense. Harder drugs are far more dangerous than alcohol and would kill far more if legal.