> When the NYPD have a guess at who did around 30% of murders

This is false.

NYC homicide clearance rates for 2021 look to be over 70% for the year, with Q4 2021 at 78%. (worst quarter - 55%, best - 86%).

https://www1.nyc.gov/site/nypd/stats/reports-analysis/cleara...

> In fact, the vast majority of police are assigned to tasks like traffic enforcement

NYPD is not known exactly known for a particularly large amount of traffic enforcement, to the point that I think you'd find most residents wish they did more of it.