to back up his claims that the US has a high tolerance for atrocities when it serves one of the US' goals... and that therefore it should not be a gigantic surprise when someone gets one in on the US.
This does seem to be the claim for which he's taking all the flak.
Sounds more like people attempting to deny reality because it might mean something about one of their social identities that's less than perfect to me.
For example, the gyrations the Republicans are going through to justify approving Gonzalez for Attorney General. Outside the US, his appointment (and probable approval) are pretty much taken as continuing evidence of the hysteria and madness that has taken hold of the US, and esp. US elites. The idea that you're going to appoint someone who called the Geneva Convention "quaint" and that claimed that torture used to gather information rather than for the purpose of inflicting pain is not really torture to become your top cop just makes your government look incredibly bad. The fact that there doesn't seem to be much of a backlash against this by the public makes your country look bad.
After all, it's not a long way from smacking around Gitmo inmates to smacking around the freshly arrested in a police cell... esp. if it's only to get "information" rather than getting a bad cop's jollies off.