But that is how Nazi governments work. "We'll show those evil citizens not to mess with us!"
It's definitely a slippery slope, Dave. I don't have the intelligence or the experience to know exactly where to draw the line on State power, but I do know when I see excessive force being used.
I'm not sure that you can rely on any one individual body to maintain any kind of line forever in perpetuaty for while an organisation may start out as legitimate its mandate may be corrupted.
Its a long running problem written about by the Romans among others.
Quis custodiet ipsos custodes?
Who guards the guards?
I think the best that you can do is set up a variety of bodies with comparitive but opposing viewpoints and let them watch each other. Hence the UK with the Lords the Commons , the monarchy, the law and freedom of the press.
Someone steps out of line it is for the others to step up.
It is always worrying when governments legislate to increase their powers while decreasing the powers of opposing bodies. Stalin did it completely