“Was the vial mislabeled?”
Could the person read English?
Could the person read English?
...probably not but we’ll never know. Asking such a question can be any a number of “phobes” or “ists”.
Someone carelessly placed an Insulin vial in the wrong area.
Someone carelessly picked up a vial and injected people without verifying the substance in that vial.
The last person to touch it, use it, pulled a major screw-up.