People are becoming addicted to prescription painkillers. They cannot just buy these products. Therefore they (or others) have to rob them. Men worry about "erectile disfunction" because of advertising. Robbers steal the same products that are advertised for this. Guns are widely available in the US. Guns are used to commit these robberies. Police shoot the suspect because he's carrying a gun.
The decoy pill bottle is just a symptom in all this.