I see the usual red herrings have turned up - accusations of the form :-
"If you can't go out and not drink - there is something wrong with you!"
and
"If you have one drink, then you will automatically have two/three/four/get paralytic..."

The second of these is presumably a description of serious addiction and anyway irrelevant to the legal alcohol limit, as such a person would be automatically well above it. Nobody here is arguing that drunks should be behind the wheel. We are saying that there is a point below which you are not drunk, and the current limit sets that at a fairly sensible level which we seen no justification for altering.

The first comment is simply insulting.
I live in a country which legally allows me to drive a car as long as I restrict alcohol consumed to a safe level. That in itself means that it is legal for me to have a drink which does not take me above that legal amount. If I go in a pub, I can have a glass of beer, or not. That is my choice as long as I stay legal.
I drink good real beer in a pub because it has a flavour which I enjoy and I can find it in a friendly place. I do not go there just to pour alcohol down my throat. The only places I can drink the beers I like, are ones which serve them fresh from a barrel, bottled beers do not taste the same. Once again, I will remind you that this is perfectly legal when driving as long as you remain within the official limit.

Quack!
GtD.