Concealed carry permit holder kills 13, wounds more.

[spin]

130. So 12 out of 100 hundred homicides is insignificant?

Add to that all the injuries caused by gang shootings.

Let's look at your 12% figure a little closer. Your link stated:

The total number of gang homicides reported by respondents in the NYGS sample averaged more than 1,900 annually from 2007 to 2011. During the same time period, the FBI estimated, on average, more than 15,500 homicides across the United States (www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2011/crime-in-the-u.s.-2011/tables/table-1). These estimates suggest that gang-related homicides typically accounted for around 12 percent of all homicides annually.
http://www.nationalgangcenter.gov/Survey-Analysis/Measuring-the-Extent-of-Gang-Problems

But the site you linked to admits there may be serious problems with crime data. First note the use of the the word suggests in the sentence, "These estimates suggest that gang-related homicides typically accounted for around 12 percent of all homicides annually."

But what does the National Gang Center say about the data that is collected on gang violence?

Frequently Asked Questions About Gangs

****snip****

5. Are gang homicides increasing?

Because numerous issues surround gang crime data, there is no simple response to this question (see Maxson et al., 2002, for further discussion). First, there is the issue of availability—or lack thereof—of gang crime data. Nearly half of law enforcement agencies report they do not regularly record any criminal offenses as “gang-related” (National Youth Gang Survey, 2009, see Regularly Record Any Criminal Offense as "Gang-Related”), and those that do most often do so only for violent offenses (Egley and Major, 2003). Second, agencies employ varying criteria for recording a crime as gang-related (Egley et al., 2006). Broadly speaking, some agencies record a crime as gang-related when it involves a gang member as either a perpetrator or victim; other agencies use a narrower approach and record a crime as gang-related only when the motive behind the crime furthers the interest and activities of the gang. Third, and consequently, the term “gang homicide” often subsumes lethal outcomes involving such diverse sources, for example, as gang rivalries, drug market participation, solitary crimes involving individual gang members, or arguments between acquaintances, such that there is characteristically no single gang homicide problem but rather many gang homicide problems (see Tita and Abrahamse, 2004)....emphasis added

With the above caveats in mind, it is also important to note that most gang-problem areas do not report having experienced gang-related homicides. Over the 2002–2007 survey period, more than half of the jurisdictions reporting gang problems in the NYGS did not report a gang-related homicide, including 77 percent of the rural counties and 80 percent of the smaller cities that reported gang problems. In contrast, gang-related homicides were most likely to occur in larger cities between 2002 and 2007, with nearly two-thirds documenting an annual maximum of one or more during this time period (National Youth Gang Center, 2009, see Number of Gang-Related Homicides). Larger cities and suburban counties remain the primary location of gangs, gang members, and gang homicides. Excluding Chicago and Los Angeles (which, on average, have accounted for roughly one-quarter of all gang homicides recorded in the NYGS over the past seven years), gang homicides increased 8.5 percent in very large cities (with populations of 100,000 or more) from 2002 to 2008. To illustrate the difficulties associated with making generalizations about gang homicide trends, the annual number in Chicago increased 22.5 percent, while the annual number in Los Angeles decreased by 52.3 percent in the 7-year time frame. These conflicting trends in, arguably, the two most gang-populated cities in the United States, underscore an important reality about gangs: “Levels of gang violence differ from one city to another, from one community to another, from one gang to another, and even among cliques within the same gang” (Howell, 1998, p. 9).

Simply stated, reports of gang-related homicides are concentrated mostly in the largest cities in the United States, where there are long-standing and persistent gang problems and a greater number of documented gang members—most of whom are identified by law enforcement as young adults (see also Egley and O’Donnell, 2008). Gang homicides appear to have increased slightly from 2002 to 2008 in very large cities, but sharply conflicting trends in the two reputed “gang capitals” serve as a cautionary warning about making generalizations about gang violence patterns.
http://www.nationalgangcenter.gov/About/FAQ#q5

I mentioned my support for the legalization of some drugs as our War on Drugs was lost decades ago. I also mentioned my support for a better financed and managed BATF and efforts by all law enforcement agencies to reduce the straw purchase and smuggling of firearms to our inner cities. I also favor much stronger penalties for those caught engaged in such activity.

But I do also support universal background checks on the sales of all firearms and a much improved NICS background check system.

What are your suggestions?