If you want less of something make it more cost prohibitive.
"No good deed goes unpunished"
If it becomes overly expensive to be a "good Samaritan" then you will get fewer folks stepping into that role. They will remain bystanders or will just continue on their way.
If the good Sam. has health insurance maybe his own insurance would cover care of his injuries.
I'll bet the health insurance will say his auto insurance should pay for it, and the auto insurance will say he wasn't involved in the accident so they're not responsible.
