My Hypothesis and Belief:
Alcohol is a dangerous substance that can cause people with certain genes to loose their ability to think rationally. It's a chemical reaction that messes up their thought process through no fault of their own other than trying it. One try or a certain amount of it could mess up the rest of a person's life if they become an alcoholic as a result.
People who think they can test intelligence with it, fail to realize that all they are doing is a science experiment with a chemical: Does this liquid screw your brain up? If so how much does it take to do that? A risk taker in this area could really harm themselves, and we need our risktakers to become CEO's. All a person is doing, is testing how their genetic make up is compatible with the substance. It is not a way to test intelligence.