Drunk driving is illegal; alcohol possession and sale is not, nor should it be.
Child abuse and neglect is already illegal, regardless of drug laws.
The issue is that we expect most people to have a drink once in a whole and continue with their lives as usual. We can't realistically expect recreational heroin use with no long term issues.
That's not a reason to ban it. The issues are caused by the user, to the user. If users are causing issues to others (violence, theft, drunk driving, et c), those are separate and already-illegal things that can and should be enforced. Arresting people for possession is basically like arresting them for pre-crime: "some other people who possessed similar things later went on to commit actual crimes, so you go to jail out of fear" is not a sane approach.
The possession and use of substances for the human body is plainly the wrong place to legislate: the war on drugs in the US has been a costly, racist, unmitigated disaster.
For alcohol? I dare you to say that to the face of someone with alcohol addiction in family. It's a simplistic black and white view. We negotiated thresholds where alcohol is restricted (age, distribution, setting) while not banning it completely. Neither unrestricted access nor prohibition were the answer.
