Sure. You don't have to, but many do. It keeps readers interested. So Tom Curley (publisher of USA Today) does. So does Sulzberger over at the Times, occasionally. The ones in disagreement are outnumbered, but they're there. Trust me, the publishers of USA Today didn't agree with Coulter, but they published her. At the TImes, they don't agree with Safire. At the WSJ, they don't agree with their liberal columnists. But readers of op-ed pages want pieces that make them say "I never thought of it that way." If you're all the same, they don't say that, and they move along.