You really do not want to live in a world where people around you are as dumb as hell. You don’t want your car mechanic, your restaurant chef, your local traffic engineer to be dumb as hell because that only makes your life worse.

Closer to you, you don’t want your customers, your coworkers, your friends, and your neighbors to be dumb as hell. Whatever you may gain by being the smartest one on your block is more than offset by the myriad ways in which dumb people make life worse.