I’d differentiate clearly between little mistakes and actual misdeeds. My son (and this might be a macho thing) was really aggressive at first, even accelerating right before braking behind someone at a light. I knew that practice, gentle coaching, and experience would take care of the mistakes, and so I would wait until the moment was past (not wanting to distract him whle he was correcting and saving our necks) and later just ask things like “Should you have done anything differently back there?” or “Can you talk to me about what just happened?” It was the attitude that concerned me more.
I reminded him frequently that the road is full of nervous drivers like me and that not everyone has his reaction times. I said, “Imagine your mother in that car over there. What you just did probably scared her. And when we’re scared we make more mistakes.” I always said (when they were younger) “Do not startle the driver.” When they were little and fighting in the back, I would pull over and stop and not budge untl they quit. Sometimes I would turn around and go home. I refused to drive with squabbling going on. Same reason: do not startle the driver.
So I wouldn’t startle him while he was driving, but I also wanted him not to startle other drivers.
I often repeated this: “When you’re out there driving, you’re on the road with old people, angry people, sick people, stupid people, crazy people, scared people, and people who don’t have any licenses.”
And this: “Every day there’s people on the road who are behind the wheel for the first time.”
He is now a good, safe, and lucky driver who just does little things now and then to tease me.
Oddly, it was my wild child, the younger, who was a conscientious, conservative driver from practice day 1. He goes a bit too fast now, but he knows what he’s doing.
Good luck, cak. It’s a scary time, all right. But it gets scarier when they go out alone and you are not in the passenger seat watching and coaching. That is when the training really counts.