Ok lets drop in some assumptions.

Your primary fear is of abuse of power, how would that be achieved.

In an unmanaged environment lets say the various agencies have a national network in place where from a single location they can assign capture filters on a whim. Then you would have the potential to easily conduct a malicious campaign against an individual or group.

However if the system was well managed with the ability to audit peoples actions, if there was no secrecy involved in the system in place and it worked, then would that still cause you the same degree of concern?

The internet is a powerful infrastructure where there is a potential for great harm, if we can’t trust our respective governments to try and control crime over the internet then it is quite a sorry state of affairs. What do you expect them to do, say ok every man for himself, free for all. Go ahead, place instructions for developing biochem weaponry, it’s the internet I don’t mind. Go hack into a system, get people personal details and publish them. After all everybody should be able to defend themselves on line.

That is not the case. As in every environment steps have to be taken to control the militants of our world. It is unfortunate that we have to for fit some of our civil liberties for the greater good.