Why would it be a "remarkable thing" to get the doctor to come to the village?

Not knowing the story or excerpt you are referring to, I can only help you by asking some questions to get you thinking about the correct answer.  Is the village far away from other villages or towns?  Are there many sick people in the village making the doctor want to stay away?  Is there a lot of violence that the doctor is trying to avoid?  What is it about the village or the people in it that the doctor would be trying to avoid?  The answer to that questions is the answer to your question.

- "he is a very real person and his intent isn't to influence us vonnegut addresses this towards the end of the letter when he says, if we choose to curse, that is by our own individual means."

the answer is not