The risks aren’t exclusive, they are additive.

Car accident risk exists in both places, the stabbing risk is higher in some.

Yes but you're not applying the weights correctly.

Accidents are just that accidents.

Not saying that we should not try to mitigate and and reduce them.

Shootings, stabbings and muggings are things that require intention.

Unless he accidentally fell on the knife 37 times...

Well let's not trivialize accidents either. They're still unnecessary and they can be intentional. Off the top of my head the number of road rage incidents involving violence is around 100/200 per year and stabbings are around 1,000. Road rage numbers are increasing as well.

In terms of probability of getting hurt, car crashes dwarf being stabbed so a flight to safety that requires more driving is almost surely increasing your odds of being harmed. Likely the numbers are underreported as well. But headlines get attention. Family of four t-boned in an intersection by a drunk driver just doesn't get the clicks that CTO stabbed in San Francisco does.

Not to say there aren't problems, of course.