If wrecking American sovereignty, lowering wages, and increasing the public welfare load aren’t reasons enough to oppose the influx of migrant invaders sitting in Tijuana, here is another: At least 30 percent of them are sick with communicable diseases they might spread to Americans in schools, hospitals, welfare and employment offices, and other public places.And by “sick,” officials in Mexico don’t mean the common cold. They mean serious disease. Some of the migrants are turning around and heading home after months of traveling through Mexico, as The New American reported today. But with a third of the 6,000 or so...