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From reading about the debate about DGU, it seems that there really isn't a good database with this type of information, it's just not tracked by all LEAs, and it doesn't get rolled up into the national crime statistics.
I also believe that cases that recieve media attention get more police resources.
There are a few shootings every week somewhere in Chicago, but it's not news and you only read about them if you read the crime blotter. It does seem however that SD/HD DGUs usually make the news.
So the amount of police resources that are assigned to a case due to its visibility may also be a factor in shootouts betweein criminals and armed citizens resulting in low rate of the criminal not being caught.
Another factor I thought of is that a lot of violence bwtween criminals is not reported, and the police don't have cooperative parties or witnesses. A lot of times all they have is a body.
When there is a shooting between armed citizen and an armed aggresor, there is at least one cooperative person who is eager to cooperate with the police, and in some cases even determined to see the criminal brought to justice.
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