If torure not effective, don't do it, make sure the enemy knows you don't do it, and make sure the troops know not to do it, and emphasize to them what you gain by not torturing the scumbags you capture.
That said, I still think this "torture is not effective" stuff is wishful thinking - for something that doesn't work, folks have been doing it for a long time! (Sorta like man-made "global warming" today. Its "true" because it fits a lot of folks agendas.)
And I think the NVA got whatever their prisoners had to tell them (including, IIRC, false confessions), which might not have been much.
People have been doing stupid things for a very long time..that doesn't make them right or effective.
I want the intel, and if treating the terrorist good gets it...all the better.