Here’s a ridiculous scenario: Imagine you drive a red car. One day, the mayor of your town says that, every week, he’s going to head over to the post office and pin up a list of people who have done bad things with red cars.

The list includes people who have bought red cars, people who have borrowed them, and people who have stolen red cars; and it includes everything from driving with a broken tail light to deliberately plowing through line of kindergarteners. The list doesn’t specify: It just has names of people driving red cars, and it says they’ve all done something bad.

This goes on week after week, and even though you’ve never so much as failed to use a turn signal, you start to notice that you’re getting dirty looks when you step out of your red car. You find yourself parking around the corner, just so no one…