I would like to add that, in my opinion, if anyone is using a belt in order to feel safer in using bad technique, or is using a belt because it gives them artificial 'confidence' to lift a given weight, then that person should not be using a belt.
A belt is a tool. It's purpose is to provide further midsection stability during lifts that require heavy support; such as deadlifts, squats, partials, etc. While it may also provide some degree of safety, it should not be used as a crutch. Your midsection still has the same stress placed on it with a belt as without one, and your muscles still have to work hard. A belt will not circumvent this.
Form follows function.