On emotion vs logic: Peter Singer
Emotion is produced by feeling, feelings are not facts but rather the subconscious existing in us that arrive and eventually pass. When something triggers us positively or negatively, that trigger manifests as a feeling. When we base our decision off of something that is temporary, it usually does not provide the best outcome for situations that require more logic; or analytical conceptualization.
This is not to say that emotions cannot produce valid outcomes – they can. If emotional outcome arises consistently from a source and is noticed, that source is validated and should be considered.