Idealistic? yes, possible? Yes. All the time? No.
Conflict is bound to happen with people, thats a matter of life. Harmony in a sense is about having things run smoothing, with minimal error. It's not really about understanding someones emotional stance, but understanding their behavior, observing the way they react to things, their beliefs, etc; if you have collected enough information in your mental database, you'll be prepared to react for whatever might happen; having a step up on someone reduces the damage they might inflict on the environment around you.
In a work environmental, you're not looking to make friends, you want people to get their job done and do it right. Workers are bound to have a crappy day, being in a negative disposition is bound to effect their work performance. Knowing how they prefer to be communicated with, might limit any negative outbursts, and might even improve their disposition; thus creating a harmony/ or a calm.
remember it's not about sympathy. You don't feel for these people, but you understand why, and how they came about to feeling a certain way. It's not about agreeing with their reactions, or w.e they're feeling. It's about putting yourself in their shoes, being objective, and not only seeing your " I don't want emotional bullshit" view. To be a great leader, you must understand the needs and wants of your people.