@Baldimo,
Some insurers and courts agree with you.
The issue of breathalyzers for all cars has been rumbling quite loudly in a number of jurisdictions for somewhat over five years.
Breweries and auto manufacturers are regularly named in lawsuits around drunk driving - and insurance money sometimes pays out on those lawsuits/claims (which is why the companies carry the coverages they do).
The awareness of their responsibility is a reason breweries (and other alcohol makers/providers) as well as automobile companies advertise safe use and sponsor safety events. It's not just for tax write-offs.
Some insurers now offer significant discounts to drivers who have breathalyzers installed in their vehicles, in addition to the discounts for having on-board driving monitors activated - and trackable by the insurer.