Yeager, what is in question is not ass-kicking or even killing, both of which you darn well know I believe should be applied to whosoever has it coming.
We're talking torture. There are good reason why men may respect an enemy warrior on the battlefield, but not a practicioner of torture. There are reasons for not doing torture that have absolutely nothing to do with the question of whether or not the torturee is a swell guy. Its about who we are, not who they are.
You wanna get just pragmatic as all get out? Okay, every boy hurling rocks at an American convoy has the potential to grow up to be an Islamic terrorist, a planter of IEDs, etc. He is in the right place, he has the hatred. Why not just kill 'em all? Nits become lice aye? Just like a scene out Exodus. It would be practical, probably stop more terrorism than merely trying to torture a little information out of some grubby dude we captured in Iraq or Afghanistan who probably knows nothing anyway.