Earlier quoted context omitted.
How much of a deterrent can the police possibly impose that would outweigh the deterrent for not driving illegally, which (in your country) is being starving and homeless?
The cops will never deter everyone from breaking the law, but they don't have to. They just need to deter a large enough % of the population to have a positive effect. Driving while intoxicated is not a crime of desperation. Even celebrities are often caught for DUI despite being able to afford a full-time limo driver. Most people who drive intoxicated have jobs and reputations they'd prefer to keep, and families at…
But if you're going to bring that up anyway, how are people supposed to get their car home from the bar in a place where the government hates public transport?