Protesters demand cops let themselves be stabbed or shot

If the nation’s police officers walked off the job today, it would be hard to blame them. Sunday’s anti-cop riots in Lancaster, Pa., have made the current de facto rules of engagement clear:

Officers may never defend themselves against lethal force if their attacker is a minority. They should simply accept being shot or stabbed as penance for their alleged racism.

In Lancaster, an officer responded to a domestic violence call at a residence where a man had stabbed four people last year. As the officer approached the house, a...