A lot of medicine is basically cargo-culting or at least it feels that way because Doctor's rarely talk about the curve of how doing something will affect an outcome down the road. Are we talking about 50% chance of bad thing happening or 1% chance in 30 years? The former is serious, but the latter is probably one of those things most people would be very happy gambling on if it means to prevent that one percent they're gonna need to take a bunch of medications with all kinds of fun possible side-effects and interactions.