

I completely disagree.
You are using the hand brake as an example. 95 percent of people (including you, evidently) don’t even understand that the handbrake is not an emergency brake, they don’t get how the behavior works, or the fact that it’s meant to be used as a parking brake, I consistently see people slam their parking pawls verytime they get out of their car. (Not to mention that it doesn’t even work while you are driving on most modern cars and has no modulation, as it’s just a button)
If not being an idiot was good enough to drive a car, then it wouldn’t be so deadly. It’s also possible to fly a plane with common sense, but you wouldn’t be happy if your pilot told you they don’t have training.
Driving isn’t easy, it’s just that we accept an absolutely catastrophic amount of accidents as a cost of doing business.
Half of people might do something when presented with a hypothetical, how many of those would translate into actual action when the time comes?