You appear to lack the historical knowledge to appreciate the joke:

The war on drugs was specifically designed to allow the government to go after the left and black people. Nixon's domestic policy chief said this in 1994:

* https://eji.org/news/nixon-war-on-drugs-designed-to-criminal...

Buddy relax. It's a joke about the way the drug war has historically developed. You might get more out of it if you read some history about marijuana in the US