One way to measure recklessness is by accidental gun accidents. Research shows that these accidents typically involve young males who are playing around with a firearm, often while drinking.
Using CDC Wonder, I calculated rates for fatal gun accidents (FGAs) by race. I also separated Hispanics versus non-Hispanics. Since some groups have higher percentages of older people who are less likely to have an accident, I focus on those in the 15 to 24 age group.
Fatal Gun Accidents Rates
American Indian 0.8
The risk for an accident will be greater for groups with higher levels of gun ownership. According to the General Social Surveys (years 2010, 2012, 2014) home gun ownership looks like this: Amerindians, 42%; blacks, 17%; whites, 40%; Hispanics, 19%; Asians, 16%. If we adjust for exposure by dividing accident rate by the proportion of the group with guns, we get this:
Fatal Gun Accident Index
American Indians 1.9
So recklessness among groups is highest for blacks and lowest for Asians. In fact, the index for blacks is 7 times that of Asians. I think I hear Phil Rushton's voice from the other side: "See, I told you so."
The high rate among Amerindians is also consistent with Cochran and Harpending's contention that these people have not been selected for tameness like other groups by many centuries of state control.