It would be even more informative if the map could be adjusted for population density.

Compare two neighborhoods: Neighborhood A has a population of 100 and crime rate of 1 per month. Neighborhood B has a population of 10000 and crime rate of 1 per week.

Assuming the crimes are equal, in neighborhood B you are ~4% as likely to be a victim of a crime as you would in the smaller neighborhood A. But in the current map, neighborhood B would look like it has a bigger crime problem.