Why NOT? Common concerns with the Less is More approach

There must be a few reasons that prevent patients or healthcare providers from following the "Less is More" or "Right Care" approach. Otherwise, we'd all already be thinking and practicing this way.
 

They are a bit exaggerated, but some examples of common statements are:

From Patients:

1. "You have to order that test! My mom had it done and it found her cancer!"

2. "The other doctor did an x-ray/gave me antibiotics/checked my thyroid, so why won't you!?"

3. "What about preventative health? Isn't that the most effective investment?"

4. "I found this thing on the Internet. And I want you to do it."

From Healthcare Providers:

1. "I don't care what it costs, I'm going to order that test. I don't want to get sued! It's better to do something than nothing!"

2. "There was this one case, and the lady had a (insert rare diagnosis), and it was horrible. I'm never going to miss that diagnosis again! Any patient with (insert a symptom) gets (invasive, expensive, not very accurate test), and that's my standard of care."

In the Controversy section, each of these are explored. Check it out and send in your questions or criticisms.