"The War On Drugs" was a misguided attempt to stop illegal drugs flowing in the country by locking up (drug users and street dealers).
The reality is no citizen black or white in the U.S. owns any cartel.
Another mistake the government made was with having different sets of punishment for the same weight of cocaine. A more affluent user was likely to use the powder version while a poverty user was likely to use rock/crack cocaine. And yet if one was caught with powder they got a lesser sentence.
We sees something similar in how the government is handling illegal immigration. The emphasis has been to go after the illegals and not the companies that hire them! Eliminate the jobs/opportunities would greatly reduce illegal immigration. Major fines and jail time for (employers) would discourage hiring undocumented workers.
In both the situations (the war on drugs) and illegal immigration the government has targeted the people at the bottom rung of the ladder. I highly doubt there was a conspiracy to lock up 12% of the nation's population based upon their race.
After all the vast majority of black men and women aren't drug users. The same could be said for all other races too!