Deterrent

If other countries know that we will not harm them in any way, they will be less fearful of the consequences. Thus, more terrorist attacks may be carried out.

Torturing terrorism suspects or any other suspects isn't a deterrent in fact it's a propaganda tool for any terrorist group ro ewxeuir. to recruit people angry by their fellow countryman's relgious person etc treatment. Firstly not all attacks are carried out by state sponsored organisations take Al Qaeda for example or FARC which has no known backing by a state. Secondly torture acts as tool for terrorist groups: "Look these guys aren't playing by the rules so why on earth should we?". Secondly where is this opposing arguments statistics for less terrorism attacks occuring as a result of more torture? In fact the reality is likely to be the opposite.