Is the "good cop routine" better than the "bad cop" routine?

You know the saying "You get more sugar with honey." Example: Awhile back I was accused of a crime, the cop came up to me and asked to talk. I said "sure". Immediately, he turned into a total argumentative, prick, basically engaging in an interrogative, angry monologue about how I'm guilty as hell. He was downright cruel and mean. His aggressive tone made me realize how SERIOUS the situation was, so I immediately invoked my fifth amendment rights and asked for a lawyer. I refused his field tests and asked if I was under arrest. When he yelled "No!" in his prick tone and then berated me more, I left and got the HELL out of there. Why don't cops realize that the good cop routine works so much better. When the cop is casual and has a friendly, casual demeanor, people will open up and tell the cop a bunch of crap. They will think "oh no big deal" I'm not in any trouble, so they will spill the beans. Also, when they trust the cop and believe that the cop is on their side, then they will elicit more incriminating information and start talking.