Chicago is a special problem in that they have weekends where dozens are shot and killed. So how do you stop it? The enforcement option is to hire hundreds of more cops and put them out on the street in hopes this will encourage the perps from pulling the trigger. This is expensive and not efficient.
Another method is to identify those who are at risk and reach out to them to find out what they need before they pull the trigger. In my profession, this becomes a more cost effective and efficient method of preventing workplace injuries. Once the true root causes of gun violence is determined, it can be gradually stopped and people across the country will stop using Chicago as an example of why guns need to be outlawed.
There are other failed alternatives such as restricting gun sales which is unconstitutional or do nothing and let them kill each other which is political suicide in Chicago.
But trials, medical bills, incarcerations and funerals are less expensive and efficient?
When people speak of deterrence for crime, there are 2 effective ones: enforcement and self defense.
Self defense is the cheapest and most efficient. Dead men don't need a trial or cell, and there's no waiting for the Cops to arrive and save your life.
But, if you want to actually prevent crime so self defense is unnecessary, a Cop on every corner and a justice system that actually enforces the laws makes the most sense. The risk of getting caught has to figure into any deterrence. "It ain't illegal if you don't get caught!"
In Hawaii, people drive like the rules don't exist. Running stop signs and red lights, passing where it's illegal, and so on. In NC, there is a city, county or state law enforcement car every 1/2 mile -- many in unmarked cars or with hidden blue lights. I made sure to watch my speed and follow all the signs, because I never knew if a Cop was right behind me or coming toward me.