I realize I should be linking, but instead I'll just respond to the panopoly of defenses of Bush's illegal wiretapping of Americans simply.
The defense is "he's using it against bad guys, and we can trust him not to use it against political opponents".
What the hell WOULDN'T this justify? You could play apologist for anything, up to and including secret police death squads, using this argument or one like it. It's a call for absolute executive power.
It's not even Orwellian, because even 1984's party was a little more subtle than this.