Yes, sometimes in cases like this, the Cop killer really is a paragon of virture, as a matter of fact.
Slimy.
Like the scoutmaster who was the object of a mistaken location raid, and attempted to use a cap and ball revolver defend himself from the scruffy looking men breaking in to his apartment. But in that case it was the raidee rather than raider who ended up dead. No charges filed of course.