I don't know why I keep returning to this stuff, but: 1. The US Government has no contact with aliens. Such an event would become the central fact driving US space, defense, and intelligence budgets. It's not mentioned once in the massive leaks. Case closed. 2. There are no simple natural cures for cancer or other killer diseases. Arguing otherwise means that doctors and pharma CEOs are letting their own cancer-afflicted families die horribly rather than admit to simple cures and diminish drug profits. Case closed. 3. Vaccines are effective. The modern victories against diseases like polio are aided but not caused by improved sanitation, etc, because vaccines stop these diseases even in nations where the poverty and sanitation remain terrible. Case closed.
Now back to space exploration, zoology, and stuff.