Most people enjoy a little drink from time to time and there is nothing wrong with this. A glass of wine a day is even recommended by the doctor. The problem appears when you get drunk and lose control. If you then consider driving, then it gets even worse.
It doesn’t mean that if you are under the legal limit of alcohol intoxication, you are much safer. Actually many of us overestimate ourselves in a drink and drive situation. Even one drink will have an effect on your judgement and driving ability.
You think that you can do things better but in fact you just do them worse. Your ability to judge things and make good decisions becomes prejudiced. If we want to avoid accidents, it looks like we have to choose: drinking or driving?!