Andrew Bacevich says it all.

According to the [Iraq] war’s most fervent proponents, Bush’s critics have become so “invested in defeat” that they cannot see the progress being made on the ground. Yet something similar might be said of those who remain so passionately invested in a futile war’s perpetuation. They are unable to see that, surge or no surge, the Iraq war remains an egregious strategic blunder that persistence will only compound.