On public transit, on the other hand, I can relax and read and pretty safely ignore the world. Worst case someone grabs my kindle or my phone and runs. I can afford a new phone. (which hasn't happened to me; I'm just saying, that's the biggest risk I see on public transit from relaxing my vigilance. In a car, well, a lot of people have killed other humans because they let their attention wander or decided to change the radio station at an unlucky moment.)
I mean, I'm not saying that your view of comfort is invalid... I'm just saying it's not universal.
That surely isn't really the worst case. This happened last Friday in Madrid, just days after someone pushed a mother and her child in front of a train in Germany (and killed the child): https://twitter.com/el_pais/status/1157564725015851008?
Granted, it's still a rare occurrence, but it seems to happen more often lately. The closest I personally came to this kind of public transport experience was standing in the first subway car when some drunk guy fell on the tracks and got killed around 20 years ago. It's not really a reason why I prefer the car these days, but also not exactly a fond memory.
As for feeling uncomfortable driving cars out of fear - most modern cars have good safety measures: https://youtu.be/cMiZa3HgRVE?t=125
I think driving without that consciousness that you could kill someone else is extremely dangerous.
Did you watch the video? It's (also) about pedestrian/biker safety measures. All new crash tests cover this and you can see very well that cars brake automatically these days.
I do have a reasonable knowledge of modern car safety features, and yes, high end (well, high trim level; these features are optional at additional cost on many cars I would call low end.) cars bought in the last few years have automatic braking systems that function reasonably well at low speeds, and that's a great thing that has probably saved many lives.
Certainly, if I buy a car again I will be sure to pay extra for these features
But these features don't make driving safe. These cars are not even close to being self-driving, and these features don't absolve the driver of vigilance.
Now, this doesn't apply to me ('cause I have a good job and can afford a recent car and can pay extra for the requisite options) but most cars still don't have those features. The vast majority of cars that are on the road today, and even many cars on the new-car lot don't have any sort of automatic-braking system.
I wish I knew what some people find so worthy of downvoting about suggesting to watch a crash test video that demonstrates the current state of pedestrian safety measures in cars. Or, what is scary/offensive about videos in general. But I suppose I don't need to understand every personality on the Internet...
I think you got downvoted because it's ridiculous to suggest that current safety features make cars safe compared to most other common methods of transportation, especially for pedestrians and bicyclists.
My sister's best friend being killed at age 17 walking on a residential road wasn't news. It isn't even rare, it's a leading cause of death for teenagers.
The dead motorbike rider I saw lying in the road didn't make the news. This is so common ambulance staff call bikers "organ doners".
The "accident" (gross negligence, IIRC) when about 15 were killed on the motorway, including one of my dad's colleagues, did make the news.
Railway (and even bus) deaths are orders of magnitude less frequent.
European cities are for historical reasons less practical to commute to by car, because they are dense, have never been planned with cars in mind and there is literally no space for your car. In such a setting a well funded public transport system makes all the sense in the world, because it uses the space more efficiently than the usual one-person-car-commuter.
And I don't think in my entire college life of taking public transit to and from school did I ever really encounter anyone or anything that made my day worse. In fact it was the opposite, since one of the things that still stands out in my mind is the day a complete stranger decided to give out roses to men and women aboard the bus I was riding, myself included.
It was such a small thing, but something that really stuck with me.