Hate crime laws serve as protection for groups who are marginalized, oppressed and were, at points in our history, left legally unprotected because of something they cannot control. Being a police officer is a choice. Also, police officers already have the full protection of our justice system. People who kill police officers almost always get either the death penalty or life in prison. Those who assault police officers get the book thrown at them. Charging them with a "hate crime" is pretty redundant.