>Right now she just wants to hunt down the person who sold Chris his fatal dose. “These dealers aren’t just selling it,” she said. “They’re murdering people.”
Drug dealers are selling the drugs not out of some kind of malice toward the addicts. The users want drugs, the dealers want money. Killing the users does no good to the dealers.
While it's hard to criticize the thoughts of a greiving mother, the focus should not be "let's punish these awful murderers!" but instead "let's find ways to eliminate the demand for drugs".