Back in the 70s getting pulled over drunk was punished like running a red light (i.e. a nominal fine). The punishments were ratcheted up to now where a DUI results in a 10k fine in some states and an immediate license suspension. With life altering punishments for getting caught, drunk driving reduced significantly and the culture of determining a DD emerged so people could continue to get hammered.
In the UK, the standard penalty for drink-driving has been the same since the early 70s - a 12 month driving ban and a modest fine for the first offence, a three year ban for a second offence and a possible prison sentence of up to 6 months for further repeat offences.
The penalties haven't changed in years, but the rate of drink driving has fallen drastically. What has changed is the culture. Persistent campaigning from both government and grassroots organisations has made drink driving completely unacceptable. Today, it would be considered perfectly reasonable - perhaps even admirable - to call the police on your own friend if you know that they're drink driving. There's now far less proactive enforcement of drink driving laws, because it's not a common enough offence to warrant random testing and the police expect to get tip-offs from the public. It's seen as a foolish and selfish thing to do, a marker of personal weakness, a sign that you're some kind of alcoholic.
It still wouldn't be considered honorable here to turn in a friend for drunk driving (unless it was obscenely over the limit). It would be mainly considered a failure of friendship that you didn't confront them and instead called it in.
Even in rural Ireland there was a relatively recent backlash because they could keep driving home drunk down the side of the road with the hazard lights on.
Also, with a 12-month ban in the UK, they must not have been enforcing it much because it wouldn't take long to have most of the drunk drivers banned. So my suspicion is that enforcement increased as well. People rarely fall for propaganda alone when there is nothing that makes it concrete.
My point is that some types of problems are more amenable to personal activism (participation in wars come to mind) while other types of problems (shared-resources/commons) have different effective solutions (taxes, legislation, democracy et. al.)
Legislation and enforcement only played a partial role in reducing the rate of driving while intoxicated. DWI was still normal and socially acceptable for decades after we started banning it. We changed our attitudes, we stigmatized the behaviour, we created new norms, we invented the concept of the "designated driver". Millions of people had to be the first person in their bar to say "just a club soda, I'm driving", the first to say "don't you think you've had enough?", the first to take the keys out of their friend's pocket and call them a taxi.
It's absurd to think that we can solve the problem of antibiotic resistance just by personally giving up meat, but it's equally absurd to think that our own choices are irrelevant. Collective problems are just individual problems at scale; the solutions are also the aggregate of lots of small individual actions. Eat less meat, buy better meat, lobby grocers and restaurant chains to sell antibiotic-free meat, write to your representatives, inform your friends and family about the issue - it all helps to move us in the right direction.