It’s hard to see what America has to gain by fighting any kind of war in Afghanistan. But if a war is to be fought at all, it should be done with overwhelming force, sustained until victory is complete. Anything less is an expense of lives and dollars in a waste of shame.

We appreciate this splendid stinging scorn for the fiasco of a war that Obama is waging, from the ever sharp pen of Diana West:

Barack Obama is sending 30,000 additional troops to Afghanistan, to come home again starting in 2011.

Madness.

Worse is the conservative reaction. The futility of “nation-building” in the Islamic world lost on the poor infidels, they deem the president’s plan correct even if undermined by the exit date.

This means the leftist White House and the conservative opposition have signed the same suicide pact to sink this country ever deeper into the Islamic Republic of Afghanistan.

For no achievable thing.

Not that our military, unleashed, couldn’t achieve whatever it wanted. Four years to roll back Nazi-occupied Europe, but eight years and counting to roll back Taliban-occupied bedrock? Today’s military, of course, is and will continue to be tightly leashed, bound by criminally restrictive rules of engagement and strategies to serve an unproven theory of “counterinsurgency,” a demeaning campaign to make 20-plus million Afghans like us more than jihad-happy Taliban drug-thugs, no matter what it takes in terms of billions of dollars and the blood of our bravest.

But this isn’t a conventional war, critics say. There’s no comparison between World War II and today.

You can say that again.

But why isn’t there? Why couldn’t there be? Or, to turn the question around, what if World War II had been fought as a counterinsurgency?

What if, instead of waging total war on the Axis powers — firebombing and nuking German and Japanese cities and, in the process, killing tens of thousands of Germans and Japanese — the Allies had tried something a little more postmodern? What if they had tried instead to win “Kraut” hearts and “Jap” minds?

What if Gen. Eisenhower, like Gen. McChrystal today in Afghanistan, had wandered through German towns, asking das volk, “What do you need?” What if Gen. MacArthur, like Gen. McChrystal today, had emphasized Japanese population protection over U.S. force protection, ordering troops to guard “the people” from everything that could hurt them? What if U.S. forces had bought and paid for a Sunni-style “Nazi awakening”? What if Gens. Patton and MacArthur had rewritten constitutions to enshrine Nazism in Germany and Shintoism in Japan? What if the United States remained to protect the new governments from “extremists” who, as President Obama said this week, “distorted and defiled,” respectively, their ideology and religion?

The East Coast would be speaking German, and the West Coast would be speaking Japanese.

Luckily, we didn’t have proponents of “armed social work” pulling the levers back then, commanders who today see in every Taliban redoubt lollipop-ready customers for micro-loans — if, that is, the troops can only survive the booby-trapped house-to-house searches to complete the necessary paperwork.

Take Marjeh, for instance. An enemy stronghold in Helmand province that doubles as a hub of the opium trade and a manufacturing center for IEDs (which cause more than 80 percent of U.S. casualties in Afghanistan), Marjeh is a much-discussed potential target for incoming reinforcements.

This promises to be a moral if not a strategic blunder. If Marjeh is so vital to the American war effort it should be bombed into surrender or smithereens, whichever comes first — not seized in a casualty-costly ground assault.

And even then, as the Washington Post notes, any Helmand Province “gains will be transitory if U.S. forces do not build effective local police forces and foster a government that is relatively free of corruption and able to provide for the Afghan people, U.S. officials said.”

Is that all? Anything else U.S. forces should do while they’re at it? “Build” Hamid Karzai into Abe Lincoln? “Foster” the Taliban into the Viennese boys choir?

“This will be a credibility test for the (Afghan) government to see if it can deliver,” said a spokesman for McChrystal.

A credibility test. To see if the government can deliver. Using flesh-and-blood Americans as game pieces. This is sickening and sick. …