Actually, people once believed it, but we're so smart today that we don't. Therefore, our minds are open to all sorts of new ideas.
Here's a quick, delightful video about confirmation bias, one of the many reasons it's a miracle that we who write and speak can persuade anyone of anything.
This is a video teaser for David McRaney’s book, You are Now Less Dumb.
Two questions for you:
1) If not geese and trees, what are your audience's embedded beliefs?
2) How will you adjust for that?