“Whether they are armed with bombs or bacteria, stopping weaponized individuals from harming others—intentionally or unintentionally—falls perfectly within the purview of the ‘night-watchman state of classical-liberal theory'” (May 1, 2009). However, the state, in the persons of the “Treason Lobby,” won’t even perform this basic obligation:

There’s a growing health concern with hundreds of illegal immigrants crossing over into southern Texas. Cabrera says agents are seeing illegal immigrants come over with contagious infections.
Detention centers and holding facilities have quarantined areas for those who come in sick. But Cabrera says the sick and healthy are separated only by caution tape.
“There’s been an outbreak of scabies that’s been going on for the past month,” Cabrera said.
Texas border resident Jorge Garcia says word about the contagious skin infection is getting around.
“Our Border Patrol agents check on us all the time and they told us about the outbreak of scabies,” Garcia said.
Cabrera says the sickness doesn’t stop at scabies.
“We are starting to see chicken pox, MRSA staph infections, we are starting to see different viruses,” Cabrera said.
Garcia believes the viruses are not confined to the detention center. Not long ago, a group of border-crossers came knocking on his door. … Cabrera doesn’t believe the federal government is doing enough. He says other Border Patrol agents have contracted scabies and he fears it will spread quickly.
“It’s contagious, we are transporting people to different parts of the state and different parts of the country,” Cabrera said.
“Just the fact we are exposed to it, and so is everyone here in south Texas, it’s a great concern to us,” Garcia said. (ABC)

For the correct, perspective, read about the “dazzling” Randian, Madeleine Pelner Cosman, Ph.D., Esq:

When Objectivists eulogized the dazzling Randian Madeleine Pelner Cosman, Ph.D., Esq., most downplayed her trenchant opposition to the unfettered flow of migrants across the 1,940-mile-long border with Mexico. To that end, the late Dr. Cosman “never hesitated to put her own time, money, and neck on the line for her beliefs,” even volunteering as a patrolwoman with the San Diego County Sheriff’s Department.
The quintessential “Renaissance woman,” Dr. Cosman was an expert aviator, health-care policy analyst, marksman, and musician. But on immigration, she sounded a bum note. …
Ms. Cosman’s study of “the effects of illegal immigration on the United States health-care system” culminated in the article “Illegal Aliens and American Medicine,” published, in 2005, by The Journal of American Physicians and Surgeons. It addressed the effects on the health system of the bleeding Southwestern border. …
That Mexico is Swine Flu Ground Zero has thrown Dr. Cosman’s work into sharp relief… not only are illegal aliens never asked about their immigration status, they go unexamined for contagious diseases, and are granted free health passes and free medical care in the event that they fall ill.
The influx of illegal aliens has serious hidden medical consequences, given that they often hail from backward and benighted regions, where “diseases that American medicine fought and vanquished long ago” still rage.
Tuberculosis had largely disappeared from America “thanks to excellent hygiene and powerful modern drugs.” But a new Multi-Drug Resistant Tuberculosis, endemic to Mexico, has crossed into the United States. It kills 60 percent of those infected. “Each illegal with MDR-TB coughs and infects 10 to 30 people, who will not show symptoms immediately. Latent disease explodes later.” …
“Illegal Aliens and American Medicine”:
TB was virtually absent in Virginia until in 2002, when it spiked a 17 percent increase, but Prince William County, just south of Washington, D.C., had a much larger rise of 188 percent. Public health officials blamed immigrants. In 2001 the Indiana School of Medicine studied an outbreak of MDR-TB, and traced it to Mexican illegal aliens. The Queens, New York, health department attributed 81 percent of new TB cases in 2001 to immigrants. The Centers for Disease Control and Prevention ascribed 42 percent of all new TB cases to foreign-born people who have up to eight times higher incidence. Apparently, 66 percent of all TB cases coming to America originate in Mexico, the Philippines, and Vietnam. …
Chagas disease is yet another disease that has been imported from Latin America and has infiltrated America’s blood supply. “Chagas affects blood transfusions and transplanted organs,” cautioned Dr. Cosman. “No cure exists. Hundreds of blood recipients may be silently infected. After 10 to 20 years, up to 30 percent will die when their hearts or intestines, enlarged and weakened by Chagas, burst.”
Seven thousand cases of leprosy over the last 30 years may seem negligible, but “leprosy, a scourge in Biblical days and in medieval Europe,” had been eradicated in the US. Now it’s back. By the reluctant admission of the New York Times, it was brought over from Asia and Latin America. …

MORE.

UPDATE (6/9): THE LOT OF LEGALS. Uncle Sam thoroughly tested me, a legal resident. They know where I lived, age 16, and what antibodies course through my veins. I would think it’s important to ensure newcomers don’t “assault” locals with deadly diseases.