I'm wondering about the right or possible interpretations for the "I don't want to know..." construction when followed by questions.
I'm not a native speaker, but in my own hypothesis the cause of "don't want to know" can be the speaker's or the subject's ignorance, or existing knowledge with regard to the answer to the question. So for the sentence , there are two possible interpretations (a) and (b):
 I don't want to know who came.
a. because I don't care!
b. because I already know! Why are you telling me this! (e.g. I feel ashamed that people have assumed that I didn't know who came)
Does this fit your intuition? Thank you!