I don't understand how people here are trying to downplay taking a drug like cocaine of all things as something normal. It's of course bad this happens, and yes victim-blaming should always be called out but in this case dangerous & risky behavior turned out well... dangerous?
Devaluing the lives of people who die because they do drugs is wrong.
If someone intentionally put poison in restaurant food and people died, nobody would say "well they were eating food prepared out of sight by someone else, they knew the risks." It's not as different as you might think. The only reason these people weren't able to know they were taking fentanyl is the lack of a well-regulated market. They were poisoned.
People are always too eager to assign personal responsibility to victims of things they themselves have not experienced and believe they would never do. Drug use is an extremely complicated issue.