Cops draw and point their guns all the time while making an arrest or confronting a criminal in the act of committing a crime. Luckily they often don't fire. They do this for their safety so why should citizens defending property or life, as permitted by law, be any different?
Well, they are cops. They can shoot people in the back and get a medal for it. They can carry into GFZ's because the state has deemed them worty. If you want to be able to point guns at people and shoot them once they stop being a threat, become a cop.