I disagree. These are exceptional powers (they deliberately negate several important rights like the right to know the charges against you and have a lawyer present), and if they are being misused, they should be taken away.

They are justified to the population on the basis of extreme measures for extreme opponents - if that is shown to be a smokescreen and the security services to be inveterate liars, I think the population will be far less inclined to accept any calls for special terror laws.

The war on terror as an excuse just became rather more transparent.