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We don't, for example, have the attitude "seatebelts are whatever, let speeding people get pulped." And there's a good history as to why we don't do that.
Even people with bad judgment deserve a shot at avoiding horrible death in a civilized society.
In truth, they were both. I've known people who drove drunk and hurt others and I've known people who drove drunk and have been hurt and I know people who didn't drive drunk and were hurt by a drunk driver.
It's a systemic problem and requires a systemic solution. Personal responsibility is the can we kick when we're unwilling to face the need to change incentives and structures.
If I found out a friend drove drunk, I'd berate the hell out of them and shame them. What a dangerous, selfish thing to do.