To advocate for more resources, try writing the Brooklyn DA's office, or calling your local precincts community patrol officers. Pointing out (what seems obvious) problems to the precinct and documenting them, places the onus on them to deal with it. (911, 311)
To find out just how much crime is occurring in your community, you can subscribe to the website http://spotcrime.com/index.php. There you can configure their Google database so that daily all reported crime within a radius designated by you, from you home address, is emailed to you.
Resources are in short supply in NYC, and the wealthy or politically connected neighborhoods tend to do better with policing and police response. Community activism can work to remedy this, but change, unfortunately, is gradual.
The 77th is a relatively high crime precinct; their number is (718) 735-0611.
As per the police, resource allocation comes from One Police Plaza, and is a result of "Computer". Those results are then parsed by Brooklyn North headquarters, and the fiat is handed to the local precinct captain. Your complaints can/may influence the start of the process at PPP.
For what its worth, the previous comment about the gym owner having a possible tie to law enforcement resonates the strongest with me.