Commentary There are forces that wish to destroy America. Some of them are visible and some are stealth. The visible forces include terrorists and certain nation states like Iran. Radical Islamic preachers cry “death to America” in their sermons, encouraging martyrdom through suicide bombings. Sept. 11 was their crowning achievement, so far. There will likely be other attacks. Some of our military leaders have so predicted. China might also make the list, if not as a destroyer, then as a nation that wants to supplant America as the world’s top economic and military power. Those who would destroy by stealth include undocumented immigrants flowing across our southern border. Their intention may not be to destroy America, but that will be the effect if we don’t quickly stop the influx and discourage others from coming. It’s almost laughable to hear some in the liberal media claim we have a “moral obligation” …