And drug users aren't all idiots that can't dose. It's possible the dealer sold a mislabeled product. Though the blame is on the end user for not doing a test shot to check potency.
Also note how the stats are intentionally skewed. They blame opiates, but then note most of the deaths are due to opiates plus other drugs as a mixture. Yet look around and try to find any safety info on mixing opiates and benzos and there seems to be little to no information.
Every day, how many patients are loaded to the eyeballs with opiates, both in and outpatient scenarios? And they don't have an overdosing "epidemic". It's not like nurses are somehow intrinsically more capable as humans of dosing properly.