Well, just to play devil's (!!!) advocate, because you don't *know* Baluchi is cooperating as fully as he might be.
Ammar Al-Baluchi was unquestionably involved with moving money and goods around for Al Qaeda and was clearly involved with helping many of the 9/11 hijackers. Although that does not necessarily mean he was an active *member* of Al Qaeda or knew exactly what the 9/11 hijackers were up to, he'd have to be remarkably incurious not to know something was up. And he was captured with correspondence that was destined for Osama bin Laden.
So this is a person who, even if he had no specific knowledge of imminent attacks, knows a lot of useful things. But that actually poses a challenge for interrogators. He can give them an impressive amount of useful stuff while holding back even *more* useful stuff.
But one thing is certain: if he *had* known more important stuff, it didn't come out under torture. Nor did torture produce *anything* useful that couldn't be produced using different techniques. And now Americans -- servicemen, agents, and innocent bystandanders -- face an increased threat of torture throughout the world at the hands of people who figure if America does it, Americans should get a taste of it too.
It's important not to be too glib about dismissing torture, because in the future we're going to find ourselves in situations where it seems like a pretty good idea. And the person we're thinking of torturing may be a very bad person -- I don't think it's unreasonable to characterize Al-Baruchi's crimes as "heinous". But if ever torture was going to break the back of an enemy it would have done so with al Qaeda after 9/11.
Well, we tried it and it didn't work. What *did* work was ordinary interrogation and intelligence tradecraft. Which should come as no surprise. We spent the 19th and 20th C perfecting those approaches, and the idea that we could do better by tearing a page out of the medieval playbook should, in hindsight, seem ridiculous.