Why is it human nature to laugh when someone gets hurt?

There is another new TV show whose premise is showing clips of people getting hurt. Massive horse kicks to the face, even to a small child. I find this appalling, and am wondering, from a psychological standpoint, why it is human nature to laugh when someone gets hurt. I am repulsed by it, and cannot bear to watch a show like that. I don’t find it funny whatsoever. This human response confounds me.