SHOULD indicates desired behavior. Krauthammer is a predictable rightwing clown. I occasionally read his column when it appears in the Miami Herald once in a while, and I find his opinions to be batty and his arguments to be feeble. So I do not heed his opinions, and just as I never leave the house without my pants, because I perceive that pants wearing is something I SHOULD do, I do not take Krauthammer seriously. He cam hammer all the kraut he wishes, and I shall ignore it all, because I SHOULD.