Just how accurate this figure given is I am not sure, but given the current state of the nation, it seems rather accurate for many reasons. First, the UNITED STATES of AMERICA has the most, according to some surveys, studies, and statistics (which may be slightly skewed and inaccurate in any strict sense of the word, INCARCERATED POPULATION, that is, in jails, prisons, and other 'detention' centers.
ADDICTION to DRUGS, ALCOHOL, VIOLENT VIDEO GAMES, MOVIES, AND OTHER MEDIA, as well as other influences and impressions, including the military aspects of life and the sports, entertainment groups, and other aspects of culture, too numerous to mention, namely the constant consumption of things and the deteriorating environment,etc. all can be factored in to give this tidbit of information.
AROUND 84-85 % of this group of SERIAL KILLERS are 'WHITE' and 16% are BLACK, if you care to think in these terms, and I don't.
HOWEVER, 90%,possibly more of SERIAL KILLER VICTIMS ARE WHITE!