If you're tired as fuck, having a near-miss scares you awake for a while. If you're futzing around on your phone, having a near-miss makes you drop that fucker. If you're drunk, having a near-miss doesn't sober you up.
Furthermore: Drunk people can also be tired and on their phones. That's one impediment more than sober people who are tired or on their phones.
"Some other shit can have the same problems as this shit that ALWAYS has those problems, so let's not stop only this shit!" is bullshit. You can always stop the other shit too, later when it becomes technically possible. That's no reason not to stop the shit now that you can stop now.
Furthermore: Drunk people can also be tired and on their phones. That's one impediment more than sober people who are tired or on their phones.
"Some other shit can have the same problems as this shit that ALWAYS has those problems, so let's not stop only this shit!" is bullshit. You can always stop the other shit too, later when it becomes technically possible. That's no reason not to stop the shit now that you can stop now.