Some animals have an amount of empathy. Humans have more. They can override it w religion, philosophy, greed, ego. Perhaps, a thing to consider is the subonscious. Going deep into the subconscious, often a feeling of being connected to all is experienced. Sometimes, boundaries separating individuals can temporarily dissapear. I could take a chance and said that this same thing is in everyones subconscious. If that was true, then it is that feeling of oneness that is slowly rising to the surface mind, closer to conscious realization.
'I am he as you are he as you are me and we are all together.', as the beatles put it.
S