Indeed, once you resort to torture or other "questionable" means, you can't accuse or deny enemies from using them too; this sets new standards. The argument is

Indeed, once you resort to torture or other "questionable" means, you can't accuse or deny enemies from using them too; this sets new standards. The argument is generally "but they already do it", and in my opinion it fails to recognize 1) the large scale validation for every belligerent, 2) the race to "no-rule" warfare, as limits are one-upped once (de facto) accepted. So it's not because _some_ belligerents are willing to use banned means that everybody should start using them too.