Do you have any links? that goes entirely against my intuition. SF is generally considered walkable and has high street crime. I'm pretty sure the same is true for NYC, Paris, Berlin, other highly walkable cities where as say Irvine, Brea, (E.T. like neighborhoods that require a car to do anything) have low-street crime.
Update:
The first 2 hits I found on google found higher walkability correlated with more crime
https://journals.sagepub.com/doi/abs/10.1177/001391652092184...
https://link.springer.com/article/10.1057/s41284-018-00161-7
https://en.wikipedia.org/wiki/Walkability#Socioeconomic
As the sibling poster wrote, by comparing the only walkable area in the downtown of a car-centered city you are [involuntarily] cherry-picking the populace that cannot afford a car. You have to compare whole countries.
In various countries sprawls, shopping districts and office-only areas are prohibited by building regulations in order to create mixed areas where people can live/shop/work and build local communities.