Because Tesla’s safety features apparently make it so that you can get away with driving drunk. Dude was obviously drinking a beer and everything. They told him they could tell he was drinking, to warn him because while they weren’t going to narc on him, someone definitely will, and he just sort of absentmindedly smiled.
I've gotten a few reports on this comment. I'm going to leave it up simply because I think the comments responding to it are good comments. And to be clear, I think it's morally correct to narc on a drunk driver. No one is moralizing about substance abuse. Drunk drivers kill people. It's that simple.
No one calling the cops on a person for being drunk. Drink all the booze you want. Just. Don't. Drive.