perspicacity and the rearview mirror

At one point, this was the bee's knees. Fifty years ago, smart people thought highways were awesome. They represented freedom and progress. Now, we see them as the embodiment of pollution and alienation.

Fifty years ago, few people questioned whether demolishing whole neighborhoods to build freeways was a good idea. It makes us wonder about the certitude of our beliefs today. What ideas and principles do we hold now that are going to look misguided to future generations?