Late on a Tuesday last November, a Drexel University graduate named Joseph Howanski encountered Merlos Mukaj and his girlfriend arguing on the street. Howanski, 24, tried to intervene, but the 21-year-old Mukaj shoved Howanski and took a swing at his head.

Howanski, who had a concealed-carry permit, pulled his gun and shot Mukaj three times, killing him.

…

George Fisher, a Stanford University law professor and codirector of the school’s Criminal Prosecution Clinic, said the approach Krasner outlined is ethically sound.

“The general ethical principle is that the crime should be charged according to what it is,” Fisher said.