This editorial reads to me like an argument against right to die or same-sex marriage. If this bill passes, everyone will do it and it will become rampant and spill into every aspect of life.
The militants who arrived for the showdown at Malheur are a threat. They threatened local people, local law enforcement, the FBI. 
The percentage of LEOs involved in deadly force exchanges is minute. Yes, the men and women who sign on for the job know that they may at some point use the gun that comes with the job. Most often it's for protection. I doubt that any LEO expects to use deadly force. In the case of Finicum and the people rallying, raging about the incident, the officer deserves full protection, including concealing his identity.