The question is, is it effective? (example: what the NV's did to American POWs, what information did they get?) From what I've read about it torture is not and never has been effective in getting intel. Also I wonder what torture does to the interrogator? nothing good I suspect.
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.