I'm not a killer. You are. That's why you've always known what...
Doakes: I'm not a killer.
Dexter: You are. That's why you've always known what I am. That's why you have more "officer-related" shootings than anybody else. Only I don't fuck with you when you shoot somebody, why couldn't you pay me the same professional courtesy?
Doakes: There's nothing professional about what you do. I kill when I have to, on the job.
Dexter: So, it's okay to take a life as long as you get a paycheck for it?