Homeopathy is a very poor example. In the USA it is exempted from the normal standards of evidence for efficacy, and thus its protected status should not be used as an argument for its supposed legitimacy. It is protected by a very old law. Its existence is still a pseudoscience, even if it is practiced by MDs and taught in some universities. Haven't you noticed that more and more unscientific practices are creeping into universities? That doesn't make them legitimate. It just proves that those institutions are more interested in making money than in avoiding the dumbing down of modern medicine.