I just watched a film about coffee growers in Ethiopia called "Black Gold." In it I learned that, at the time of filming, coffee growers were receiving the equivalent of 23 US cents for a kilogram of coffee. That's 80 cups of coffee.
Perhaps shooting the boards of companies like Nestlé, Sara Lee and Starbuck's would be a good start to changing this kind of exploitation?
Obviously, I think that economic justice for these farmers would be a better solution than wholesale executions, but I must admit I have very little sympathy for these motherfuckers unless they change their behavior.