The overall effect size for police force size on crime is negative, small, and not statistically significant.
Police are not primarily crime fighters, according to the data | Reuters
At this point, the sensible, evidence-backed, research-based policy position is that the most efficient way to “fight crime” is to improve the material conditions of people by housing the homeless and guaranteeing a universal basic income.
Any position that suggests more investment in law enforcement is either unaware of the prevailing facts, or willfully ignoring them.