Torture is one of the mainstays of intelligence gathering and is conducted by pretty much ever country on the planet.
I wouldn't disagree. That doesn't make the intelligence gathered useful though.
I give you Saddam's weapons of mass destruction as a prime example.
One of Saddam's son-in-laws told US Intelligence that he believed Saddam was making WMDs. He's not really got anything except rumours he's heard around the palace, so he embellishes his story by talking about anthrax in milk tankers. It's 100% made up. All of it. It's preposterous, but the Intelligence Services exist to check this sort of thing out. It's their day-job.
You can imagine it now. Every tin-pot regime available, torturing away at anyone who falls into their grasp.
Torturer: "Saddam has WMDs hidden in Milk Tankers, doesn't he?"
Victim: "No"
PAIN FOLLOWS
Torturer: "Saddam has WMDs hidden in Milk Tankers, doesn't he?"
Victim: "Yes, hundred of Milk Tankers"
Now, they probably both know that's not true, but they both want to please someone...
Torturer: "Where are the WMDs hidden in Milk Tankers?"
Victim: "I don't know"
PAIN FOLLOWS
Torturer: "Where are the WMDs hidden in Milk Tankers?"
Victim: "In the desert, 100 miles south of Basra"
Torturer: "Now we're getting somewhere".
A REPORT IS WRITTEN
George Bush states on TV that Sadam has WMD hidden in milk tankers.
A Military Intelligence Analyst checks the report and spots the small flaw in the data that not only is there no desert 100 miles south of Basra, there's no Iraq, just the sea. In the meanwhile the torture victim, his usefulness gone, has been noisily strangled to death because bullets cost money and they make more mess.
In the meanwhile, an invasion has been launched because no-one wants to admit they gave the President a report with unverified nonsense in it.
OOOPSIE.