It actually does, as for one example, it was researched.
"Wits School of Governance Report-Analysis of the Effect of the Firearms Control Act on Crime, 2000 – 2014"
The ultimate conclusion was, to effectively combat crime, the focus must be on policing itself, stricter gun control is not the answer, policing is, meaning actual visible policing, "boots" on the ground, the SAPS actually doing their duties, carrying out their mandate, not only that but getting rid of corruption within the SAPS, Detectives solving their cases, the prosecutors convicting the criminals, the justice system working and functioning as it should.