Sure, I can't be absolutist. But whenever I can, I do something. Respond. For the car, you might not be able to reach, but emit something that convey concern and care.
What if that approach of over protecting brings up a future lazy, spoiled, weak willed adult that will conduct miserable lives because up to 36 months all their brain saw is that crying always got them attentions and everything they wanted?
You don't know whether your approach is the best one, I don't, speak with as many professionals you can.
I approach it the other way. I wouldn't succumb to every tantrum. I try to build a solid emotional bridge so that the kid can stay grounded and relaxed as much as possible.
I'd love to speak with interesting professionals. So far I've met none.
You’ve successfully expressed the “parent in whatever mechanism makes me emotionally fulfilled” style. Many others take a more scientific viewpoint more oriented around child outcomes.