I suspect that a big reason that alcohol has never been included in the war on drugs is that so many politicians are lushes.
Forgotten the 18th Amendment, have you?
did you ever hear about prohibition?
Alcohol was the very beginning in the War on Drugs, when it didn’t hold, Anslinger needed another demon, weed.
https://www.votehemp.com/PDF/The_Forbidden_Fruit_and_The_Tree_of_Knowledge.pdf
This same class of do-gooders were once able to ban the production and sale of alcohol in the USA.
Our prisons were full of bootleggers and their enforcement, distribution etc.
I'd be more inclined to believe it goes back to money. As in, Big Alcohol is who their donors are.