Slander

In Romans 1:29-32 the list of sins deserving death includes slander. It might seem disproportionate at first, but go read these stories about how Tim Hunt was forced to resign because of lies by Connie St. Louis, Deborah Blum, and Ivan Oransky, about a Florida man who incited attacks on strangers from his parent's basement and how Pakistan's rent-a-mobs let you deniably kill your enemy for a few bucks with just an accusation.

Maybe slander isn't so supportable after all. A penalty proportional to the injury, perhaps?