I appreciate your thoughts.
Simply have them do science and seek rational answers to questions.
One of the point's is to teach how to "do science" and how to recognize a "rational answer." There are hard-won and specific techniques that may seem counterintuitive and, at the least, are not often witnessed in everyday life.
The scientific method can be applied at any level and kids are often natural scientists.
Agreed. And kids love games, which makes a scientific-method-teaching game or dozen seem a good idea.
As in, "Dad told me never to play with fire or I will get a licking. Now that is a testable hypothesis...."
You learned the "testable hypothesis" concept somewhere! I doubt the concept, or how to implement it, is understood by most. Neither the concept or implementation are simple; they remain the most often debated parts of science in every field.