Haha there are people on the kira hating, shin hating, kira loving, and shinn loving sides that will not listen to your reason because your reason for loving/hating someone could be that persons reason for feeling the complete opposite. Everyone will find different aspects of these characters that they will like or hate and you cannot make them feel differently about that, well in most cases you can't. Just accept that people are gonna feel how they do about the characters and just state your own opinion without worrying about trying to convert people to your opinion with reason.