[Ditto]

I think to pursue his analogy, if there is an ailment, we'd diagnose and treat it instead of just waiting to see if it kills us.

The pursue the analogy even further --- Since we know that brain tumors can cause pain, the next time you get a headache, you should go directly to surgery instead of waiting to see if it's something else causing the pain.

[ditto5]

Right. But what if you've had hundreds of scientists look at your "headache" and tell you that it's more serious than that and you do need surgery?