Because each of these perps were not on their first, second, third, fourth, fifth, or sixth violent offense and were freely out to kill:
https://en.wikipedia.org/wiki/Killing_of_Debrina_Kawam
https://en.wikipedia.org/wiki/Killing_of_Iryna_Zarutska
https://www.cbsnews.com/newyork/news/nypd-men-pushed-subway-...
Many more such cases occur and aren’t widely reported. I’ve personally witnessed a stabbing on a bus
My chances of being stabbed inside my car are much lower
This is the same attitude as people who are afraid of commercial flying despite it being the single safest form of transport. I get it. But it's irrational.
You might not get stabbed, but driving is incredibly dangerous. Even just in terms of violence: road rage is tolerated to a large extent in America. The difference is that the news doesn't report even a small fraction of the traffic deaths in this country. In Iowa, the state I used to live in, around 300 people died every year from driving. I don't know a single one of those people despite their death being a tragedy. Whereas the stories you linked were broadcast coast to coast.