"He who is glad at calamity will not go unpunished" - Proverbs 17:5.
I used to like watching "Married with Children." That show was on because schadenfreude is real. "America's Funniest Home Videos" is still on because of schadenfreude - the joy in other people's sufferings. This is the opposite of love. Jesus echoes Proverbs 17:5 in Luke 13:1-5, warning us that we should not think we are lesser sinners than others who suffer calamities, but what happens to them should trigger our own repentence.