This is a strange time for U.S.-Mexico relations. The Mexican government just issued a travel advisory warning Mexicans about going to Arizona — where they could get arrested by the police for no reason — and the U.S. government just issued a travel advisory warning Americans about going to northern Mexico — where they could get shot by drug dealers for no reason.

Oil, however, is too complicated for simple solutions. Whether this spill turns out to be the result of a freakish accident or a cascade of negligence, the likely political outcome will be a moratorium on offshore drilling. Emotionally, I love this idea. Who wants an oil drill in his park or on his coastline? Who doesn’t want to punish Big Oil on behalf of the birds?

Moratoriums have a moral problem, though. All oil comes from someone’s backyard, and when we don’t reduce the amount of oil we consume, and refuse to drill at home, we end up getting people to drill for us in Kazakhstan, Angola and Nigeria — places without America’s strong environmental safeguards or the resources to enforce them.

Kazakhstan, for one, had no comprehensive environmental laws until 2007, and Nigeria has suffered spills equivalent to that of the Exxon Valdez every year since 1969. (As of last year, Nigeria had 2,000 active spills.) Since the Santa Barbara spill of 1969, and the more than 40 Earth Days that have followed, Americans have increased by two-thirds the amount of petroleum we consume in our cars, while nearly quadrupling the quantity we import. Effectively, we’ve been importing oil and exporting spills to villages and waterways all over the world.

Several years ago, the agency considered requiring the installation of relatively inexpensive ($500,000) remote-controlled switches on offshore drilling rigs as a backup mechanism for shutting down spills like the one that’s running out of control today — but decided it wasn’t needed because there were other ways for drillers to cut off their wells.

Late-night comedians, recalling World War II movies in which Gestapo officers demand "show me your papers," find echoes of fascism in Arizona's belief that there are occasions when police officers can reasonably ask for someone's documentation. On Tuesday, Barack Obama, showing contempt for the professionalism and character of police officers, said: "Now suddenly if you don't have your papers and you took your kid out to get ice cream, you're going to be harassed."

In today's debate, the threshold question is: Should the nation have immigration laws? Until 1875, there were none. There are strict libertarians who believe there should be none. But the vast majority who do not favor completely open borders believe that there should be some laws restricting who can become residents, and presumably they believe that such laws should be enforced.

Once Americans are satisfied that the borders are secure, the immigration policies they will favor will reflect their -- and the law enforcement profession's -- healthy aversion to the measures that would be necessary to remove from the nation the nearly 11 million illegal immigrants, 60 percent of whom have been here for more than five years. It would take 200,000 buses in a bumper-to-bumper convoy 1,700 miles long to carry them back to the border. Americans are not going to seek and would not tolerate the police methods that would be needed to round up and deport the equivalent of the population of Ohio.

Today's hysterics are unoriginal. But they learned their bad manners from a master.

Obama administration officials hit the Sunday talk-show circuit to defend their response to the massive oil spill off the coast of Louisiana, stressing that President Obama has been on top of the situation since "Day One" and shrugging off comparisons to the George W. Bush administration's handling of Hurricane Katrina.

Speaking on "Fox News Sunday," Homeland Security Secretary Janet Napolitano said it's British Petroleum — the company that owns the well that exploded on April 20 — that needs to be doing more to contain the disaster. ...

Although Mr. Obama did not make his first public statement on the situation until nine days after the initial oil rig explosion, Ms. Napolitano and Interior Secretary Ken Salazar said he was involved early on behind the scenes, overseeing the administration's response.

Arizonans, like all Americans, have every right to be furious about Washington’s protracted and bipartisan failure to address the immigration stalemate. To be angry about illegal immigration is hardly tantamount to being a bigot. But the Arizona law expressing that anger is bigoted, and in a very particular way. The law dovetails seamlessly with the national "Take Back America" crusade that has attended the rise of Barack Obama and the accelerating demographic shift our first African-American president represents.