Radical mosques are the spark lighting the fuse that can kill Americans. That has killed Americans. That will kill more if we let it. Such killing sprees, moreover, are plotted by young, male, Muslim militants who often enter to the United States on student and other visas from places known to sponsor or export terrorism. None of this is news. But it is cloaked in taboo. Thus, controversy was stoked last week when Mitt Romney, the Massachusetts governor and potential Republican 2008 presidential hopeful, did something that you should never do in this country. Not, at least, if you want...