I'm not sure that I'd say "most", but I bet the numbers are higher than most people would think. My Wife's best friend was hit by a car and killed while trying

I'm not sure that I'd say "most", but I bet the numbers are higher than most people would think. My Wife's best friend was hit by a car and killed while trying to cross a freeway on-ramp on foot. A good college friend was killed when she ran a red light as a result of being distracted by her phone. A personally know a couple of people who had car accidents while driving and killed either (a) passengers in their car or (b) bystanders. In the drinking & driving example, you can say that the person drinking & driving was responsible, but it's still considered "unintentional". For the first two examples, the "unintentional killers" are completely innocent of any-wrongdoing, but you could still assert that they "unintentional killed someone in a tragic accident". I'm sure most people who have had similar experiences don't talk about it.