It may be flawed and incomplete, but what other database is there?
I'm still searching for the one which establishes
the very real and terrible pattern of police killings of African-American men, the one that shows that blacks are being killed in numbers disproportionate to criminality statistics.
As for the second stat, about young blacks being killed disproportionately as compared to young whites, it's interesting to note the similarity to the statistics of young blacks being killed
by anyone as compared to young whites. Have a look at these from the CDC:
Leading causes of death by age group - White Males 2010 (most recent data)
http://www.cdc.gov/men/lcod/2010/LCOD_WHITEmen2010.pdf
Ages 15-24, homicide is the third highest cause at 8-10%.
Contrast that to Black Males
http://www.cdc.gov/men/lcod/2010/LCODBlackmales2010.pdf
where homicide is the leading cause at
50%.
Is there a correlation between young blacks being killed by police and young blacks being killed
by anybody? Could be.