Anubus,
You must remember that the mess he is in is because of his OWN actions. If you love him you will do the right thing and let him FACE the consequences of his own actions.
His "woe is me pleas" have led you to do codependent things (i.e. letting him drive your car w/o license) that are hurting not only him but YOURSELF. If you have ever heard alcoholics in long term recovery speak you will hear them say that are GRATEFUL to the person/persons/ situations that forced them to face the consequences of their drinking.
You need to get some distance from him and his Mom so you can see things more clearly.
THinking of you and praying you'll do the right thing.