Two trends bedevil America. One is taxes. The second, more important, is marriage. Those who pay no taxes have no check on their appetite for services. If somebody else is paying, nothing’s unaffordable. At the federal level, 41 percent of the U.S. population is totally outside the income tax system, according to the Washington-based Tax Foundation. Since 2000, the number of filers with no tax liability, zero, has increased from 29 million to 42 million in 2005. Of 132.6 million returns filed in 2005, only 90.6 million paid taxes. The rest got back all they’d paid in — and more....