In 2021, there were almost 43,000 deaths in the U.S. as a result of motor vehicle crashes according to the Dept. of Transportation. That year, the CDC estimates that there were approximately 26,000 homicides in the U.S.
Even if every single one of those homicides was the result of a break in - and obviously they weren't - a car crash is still more likely to be deadly than a break in (especially on South Montgomery give how narrow it is).
Of course, neither scenario is good. You'd have to ask SPD why they can't do both - try to make traffic on S. Montgomery safer AND have someone patrol the neighborhood at night. Beyond the obvious fact that, legally,
the police aren't obligated to protect private property.
But if, for some reason, SPD has to pick one or the other, it seems like focusing on traffic is the right course of action.