I am still amazed at the level of scientific ignorance despite the attempts of many here to educate people. Once again (it's been written many times in this and other threads, but apparently you haven't read it.) theories do not become laws. Theories are an endpoint of science. They are explanations of observed phenomena. Laws are an expression of an observed regularity. (Example: Law of gravity gives the force between two objects, theory of gravity explains why there is a force and why the force is what it is) Both theories and laws are supported by a variety of observations. While you are correct that theories are unproven, so are laws, hypotheses, and any other statement made in science. Science simply does not deal with proof. Science does deal with statements that make predictions. If these predictions hold true, it lends weight to the theory, law, etc. If the predictions are found to be false, the idea is rejected.
What is even more interesting is that a "law" such as the law of gravity is not necessarily correct in all "ways". For instance, the law of gravity assumes instantaneous action at a distance which has been superseded by the theory of relativity.