Tens of thousands of people who earn too much to qualify for the U.S. government’s taxpayer-subsidized public housing live in the facilities nationwide and the federal agency that runs the program has no intention of evicting the violators. That’s because “there are positive social benefits from having families with varying income levels residing in the same property,” according to the Obama administration official that runs the program.Some beneficiaries earn tens of thousands of dollars a year more than the threshold allowed to qualify for the cheap housing and, in at least one case, a millionaire pays a mere $300 a...