It could make sense. We don't know the numbers.
Let's say net X lives are saved each year because of automatic lights turning on.
Let's say net Y lives would be saved each year without automatic lights, via more effective detection of drunk drivers and stopping them before they kill someone.
Is X > Y? We don't know.
> Eliminatung DUI is not a matter of detection
There are a lot of avenues to decrease DUI, among which one is effective detection combined with enforcement.