Choose not to share ? A lot of times it is difficult to tell and if you have dishonest nurses like the one below [0], what do you then ? Victim blaming is easy but people can get infected not due to their own fault.
The #1 killer in the US is heart disease, but insurance companies cover those medicines quite readily, despite the fact that one can choose not to eat fast food or smoke.
There are many other ways to get hepatitis C. For instance, it is not an unknown phenomenon that drug addicts use needles as a weapon. Errors in healthcare, e.g. needles or blood transfusions.