In our opinion, yes.
It's worrisome to note that the security services don't seem to be in much of a rush to acknowledge their mistakes. For example, let's review their conduct in the case of Mr. Arar. Justice O'Connor gave a full account of the whole flight process, the purpose of which was to hurt his chances of repatriation and also to promote the story that he was a dangerous Al Qaeda agent once he was back in Canada. Instead, they should have faced the facts, acknowledged their mistakes, and repaired the damage.
In all the cases to date, the security services have tended to try and justify their actions. And that's particularly worrisome. It only further highlights the need for an oversight mechanism.