Other Western nations facilitated capture and detention, they are helped get people to the CIA. So you are seriously telling me that they didn't suspect? Really???
Look, the EU is willing to drag planes from the sky to support the US in getting Snowden, so you think they don't know what the CIA was doing? Really???
in reality, everything is excused when it is against the enemy. but even then, the problem here is that 1) most things were done just out of sadism. for no real benefit. US tax payers pretty much paid for a BSDM dungeon for some sick CIA operatives. 2) several cases caught lawful citizens and great pains were taken to make it look like nothing happened.
This is meaningless if you get to define any innocent/held-without-charge person as 'enemy'.
2. There is abundant proof that the US engaged in a deliberate, not occasional, policy of torture, whitewashed as "enhanced interrogation techniques".
3. There is so far no proof that other western nations have recently had a policy of deliberate torture, except for the sad cases where the US creatively outsourced some of its torture needs to Poland and perhaps a few other eastern european countries.