IMHO, the idea that law enforcement should have either all or no access to online data is a false dichotomy.
Wiretapping capability is less relevant than ever IMHO, in a time with more privately-owned cameras and personal communication devices than ever; it is more likely than ever that criminals will leave physical evidence of physical crimes, and so there is less reason than ever to invade people's privacy or criminalize thoughts and suspicion/conspiracy/planning of physical crimes when the damage comes from the follow-through, not the imagination. Violent crime has been declining In Canada and the US for decades. This idea of urgency simply doesn't fit those facts.
The Internet is basically a bunch of random thoughts. In a sense, people are having public conversations, but in another people are simply thinking out loud; the more we hold to criminalizing thoughts, the more we create problems by that process and criminalize freedom of thought.
I'm for warrants, and against vigilante justice, but I also really think we need to dissect this idea that only law enforcement should have, or even already has, the tools to address all dangerous situations. IMHO, the less individuals rely on institutions the better, since it is well known that power corrupts. So far Canada and the US have had pretty good luck and the public has had some success holding institutions accountable for abuses of power, but I don't get the impression that influence is as strong as it needs to be, going forward (and I don't know how to fix it while continuing to empower institutions that quite predictably stray from their mandates rather than close shop). IMHO, Institutions pose an unnecessary risk as they continue to grow and claw for more power - in this case, pushing for more surveillance capabilities. I would rather be responsible for myself, without the help of institutions, wherever possible.
As we create new potentials, and empower people to help themselves, I think the role of institutions should decrease. Take the recent article on the French police offloading missing person searches on Facebook for example. ( http://www.itworld.com/networking/357720/french-police-end-m... ) As much as I don't like Facebook, I think that's the right tool for that job, and I would like to see more work to empower individuals in that sense. It's a wonderful thing to be not needed because you actually solved a problem. I, for one, would love to not need to rely on (and pay for) the police or government because I was safe and had a voice of my own.