The drug war is a control tool in the Republican quest for ever more wealth at whatever the cost. With income inequality at record levels there is a need for greater control of the population. Through mass incarceration, constant surveillance, ever-morphing "enemies", and a war economy. Never-ending religious wars in the Middle East, and a war at home. The war on drugs is foremost a war on people. See: Newt Gingrich 1995 death penalty bill for 2 ounces of cannabis.
Ronald Reagan, 1980 campaign speech1: "Leading medical researchers are coming to the conclusion that marijuana, pot, grass, whatever you want to call it, is probably the most dangerous drug in the United States, and we haven't begun to find out all of the ill effects, but they are permanent ill effects. The loss of memory for example."
Republicans think they can spend an infinite amount of money (many trillions of dollars) on health-insurance-company-based healthcare, and have an infinite number of babies, to feed their appetite for endless ground wars, and for more inmates for more prisons for more drug war.