If a change in policy is in the American national interest, then it is a good idea. If it is not, then it is a bad idea, and something we should not do.

In another era that would be so obvious as not to bear repeating. But seeing to our national interests (just as we expect other nations to see to theirs) has been rather lost along the way by our leaders the past dozen years, and now sounds almost touchingly quaint.

But...