It's hard to get an emotional reaction out of bare numbers and facts. If you tell people "x million people starved to death in a famine", we all intellectually agree that it's horrible, but it doesn't seem shocking. If you tell people, "no seriously, here are some stories about people cannibalizing each other because they were starving from a famine", it gives you an emotional gut punch because you get a stronger grasp of the utter despair and suffering involved.