Governments are formed to be for the people, by the people. They are supposed to meet the peoples needs.
One difference between the psychologists and the psychiatrists is that due to their different training, all the psychiatrists but not all the psychologists can prescribe medication. This might be different from state to state, but generally psychologists focus on the psychotherapy.
The example that is being described above is a specific purpose. It is because a specific purpose is a way of interacting to the audience, giving a clear and understandable information that will develop the general purpose of the subject. It is a way of having to tell the audience your main goal or the important content or purpose of the topic that the speaker is talking about.
