If you think the sole purpose of the War on Drugs was to slap black people around then idk what to tell you
I mean, I can't tell you what goes on in the minds of congressmen. I'm not psychic. But the laws are harsher on black drugs and enforced more in black communities. Whether that was the intent or not, it's the end result. People with felony drug convictions generally don't find employment after release, so they go into stuff like violent crime. It's all connected.