I don't object to people asking why - I do so myself. My objection is to the idea that multiple emergent consciousnesses should require more explanation than the mere fact of consciousness at all. We are always examined as deviations from not merely the norm, which we are, but from the 'correct' way to be. People don't ask 'Why are there several people in this body?'. They ask 'How did this person come to have several personalities/spirits/muses/the delusion of same?'. That, I find insulting.