People are being killed by bombs, bullets, and starvation. Such situations have become the norm on the continent of Africa. This event almost registers no emotion for me. If I watch a movie or read a novel, I can imagine what the situation is like and sympathize. But it is impossible for me to feel what those people feel.
Space clearly matters.
And time matters as well. If an event occurred a long time ago, we can excuse it much more readily. Yet, it registers less emotion in me than the prisoners I saw on death row in Jamaica. I saw those people, learned of their unjust trials directly, and actually felt their pain. The closest I can come to concentration camps is by visiting the locations and museums where they used to be.