Dave,
The questions I think you're driving are:
- Is it proper to expect someone to violate their conscience or principles with regard to medical treatment?
- If it is not proper to expect some to violate their conscience or principles with regard to medical treatment, to what degree are other people resonsible for the consequences thereof?
The answer to the first question is easy because that's a matter of individual right to choice. The answer is, "No."
The answer to the second question is not as easy because now we're dealing with the balance of rights and responsibilities between multiple parties.
For example, if an animal rights activist, or for that matter a JW, steps on a rusty nail on your property to what degree are you responsible? Are you responsible just for treatment of the injury or are you responsible if they refuse a Tetanus immune globulin injection and subsequently die of tetanus?
The only way to be fair to both parties is to apply the reasonable person standard.