You rarely hear about it as the results were not what Obama expected.
From the report on the subject of the defensive use of guns by crime victims...
Defensive Use of Guns
Defensive use of guns by crime victims is a common occurrence, although the exact number remains disputed (Cook and Ludwig, 1996; Kleck, 2001a). Almost all national survey estimates indicate that defensive gun uses by victims are at least as common as offensive uses by criminals, with estimates of annual uses ranging from about 500,000 to more than 3 million (Kleck, 2001a), in the context of about 300,000 violent crimes involving firearms in 2008 (BJS, 2010). On the other hand, some scholars point to a radically lower estimate of only 108,000 annual defensive uses based on the National Crime Victimization Survey (Cook et al., 1997). The variation in these numbers remains a controversy in the field. The estimate of 3 million defensive uses per year is based on an extrapolation from a small number of responses taken from more than 19 national surveys. The former estimate of 108,000 is difficult to interpret because respondents were not asked specifically about defensive gun use.
A different issue is whether defensive uses of guns, however numerous or rare they may be, are effective in preventing injury to the gun-wielding crime victim. Studies that directly assessed the effect of actual defensive uses of guns (i.e., incidents in which a gun was “used” by the crime victim in the sense of attacking or threatening an offender) have found consistently lower injury rates among gun-using crime victims compared with victims who used other self-protective strategies (Kleck, 1988; Kleck and DeLone, 1993; Southwick, 2000; Tark and Kleck, 2004). Effectiveness of defensive tactics, however, is likely to vary across types of victims, types of offenders, and circumstances of the crime, so further research is needed both to explore these contingencies and to confirm or discount earlier findings.
Even when defensive use of guns is effective in averting death or injury for the gun user in cases of crime, it is still possible that keeping a gun in the home or carrying a gun in public—concealed or open carry—may have a different net effect on the rate of injury. For example, if gun ownership raises the risk of suicide, homicide, or the use of weapons by those who invade the homes of gun owners, this could cancel or outweigh the beneficial effects of defensive gun use (Kellermann et al., 1992, 1993, 1995). Although some early studies were published that relate to this issue, they were not conclusive, and this is a sufficiently important question that it merits additional, careful exploration.
http://www.nap.edu/read/18319/chapter/3#16
This is probably the most up to date report available and is quite interesting to study. It impresses me as fair and unbiased. Obviously more peer reviewed research needs to be done on the subject of gun violence but it must be totally fair to both sides of the debate. I feel both sides have valid points to make and in order to make intelligent decisions we need to hear them.
You can view the entire report at:
http://www.nap.edu/read/18319/chapter/1
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