I have mixed feelings about it, even though it is quite clear that waterboarding is mental torture.
I don't want to allow our enemies to have certain knowledge that they will not be waterboarded, (or their loved ones water-boarded while they are forced to watch), or otherwise tortured. We Americans are already seen to be lacking will as it is. Why would a hardcore enemy otherwise give up any strategic info? A determined radical could hold out for a very long time absent something like waterboarding, or more precisely, the fear of something like waterboarding. This sort of thing could have its place.
And yet, because I despise and distrust big government, I am generally afraid of allowing it to torture anybody, least of all American citizens, or doing it on American soil.
I liked it better when we knew our CIA would be as ruthless as they need to be, but we never had to know about it. Maybe I could be ok with this kind of thing if there were very stringent conditions that had to be met before utilizing something like waterboarding.
There is no question that waterboarding is a bit more civilized than chopping off digits one by one, or jamming a red-hot poker up the poop shoot...