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