Here's a little analogy for ya;
Lets say you are a school teacher. You have 20 students. You choose 2 of those students to be the whipping boys. For years you slap them in the face whenever they try to answer a question. Then one day you decide that this behavior is wrong, and you stop the slapping.
Do you expect the Whipping Boys to begin to act like everyone else all of the sudden? Do you think it might take some extra effort on your part to build the trust of the Whipping Boys? Do you think maybe the Whipping Boys might need some extra attention just to get to the same level as the rest of the class?