Let me attempt to answer your question of unconditional love. I do believe it's possible but for brief moments only. If your looking for constant, not possible because IMHO there are no absolutes in this world. Even the most harden criminal with no conscience or guilt or empathy is able to briefly express compassion, love and empathy, BRIEFLY. The reason for that is the same why normal people can not show unconditional love constantly. There are no absolutes. No one is 100% evil or 100% good or 100% loving or 100% hating.

To expect unconditional love all the time from every one, is unrealistic. But it does exist and is possible for brief periods of time.