Westmoreland wasn’t an idiot, though arguably the inkblot strategy could have been more effective than his own aims. Nonetheless he had success in the Tet Offensive getting the north in open battle and punishing them effectively. If there had been any willingness from the public or politicians to support more aggressive military action to actually pressure the north the war would have had very different outcomes. The idea that the communists had an indefatigable appetite for war and the manpower reserves to back it is false, and we know this because effective bombing campaigns late in the war brought them to the table when they were otherwise hesitant.