I don't know ...killing is worse than torture which is worse than aggressive interrogation. But we accept killing the bad guys because we absolutely believe we are the good guys. Perhaps that is really where the difference between absolutes and relativism lies.
Obama gets on his high horse about us losing our moral compass because someone who we got valuable intel from got wet. But he loses no sleep at night while unmanned drones perform executions of the enemy under his orders . I guess it is ok that we assassinate based on intel that was obtained without causing us moral angst.
I have no doubt that there is a healthy debate to be had about which interrogation techniques work better ..I'm sure those law enforcement people from other nations often have all the time in the world on their sides and can wear the subject down slowly with kindness.
As I have noted elsewhere the reason these methods were adopted was because of the intel gap that we found ourselves in after the attacks on 9-11 ....intel gaps which were in no small part due to the thought that the war against jihadistan was a law enforcement exercise.
I give you as an example Obama's man at DNI Dennis Blair (from the redacted portion of his comments ) :
But ... as far as effectiveness goes.....I think Wrechard at Belmont Club said it best .
Belmont Club » Terrorism and moral torture