Why do people mock the misery of others?

On social media I often come across videos of people being seriously hurt, kidnapped etc. What I often see in the comments section are people making jokes of a serious situation. This rubs me the wrong way, when I confront some of these people they call me a simp and sensitive. I guess we see so much violence that it's just become routine to us. I am a very cold person emotionally at times. But I still have a heart and sympatheic for people in times of misery and pain.