Rebecca Solnit says it's pain:
In economics, we talk about “externalized costs”: this means the way that you and I pick up the real cost of oil production with local and global ecological degradation or wars fought on behalf of the oil corporations. Or the way Walmart turns its employees into paupers, and we pick up the tab for their food stamps and medical care. With the drug economy, there are externalized traumas. I imagine them moving in a huge circulatory system, like the Gulf Stream, or old trade routes. We give you money and guns, lots and lots of money. You give us drugs. The guns destroy. The money destroys. The drugs destroy. The pain migrates, a phantom presence crossing the border the other way from the crossings we hear so much about. The drugs are supposed to numb people out, but that momentary numbing effect causes so much pain elsewhere. There’s a pain economy, a suffering economy, a fear economy, and drugs fuel all of them rather than making them go away.
One of her suggestions:
We’ve had movements to get people to stop buying clothes and shoes made in sweatshops, grapes picked by exploited farmworkers, fish species that are endangered, but no one’s thought to start a similar movement to get people to stop consuming the drugs that cause so much destruction abroad. Picture middle-class people here stuffing the blood of campesinos up their noses. Picture poor people injecting the tears of other poor people into their veins. Picture them all smoking children’s anguish. And imagine if we called it by name.
The Dish 