However, there's a huge difference between (a) setting up means for spying on 100% of the people and (b) developing operational excellence in LE to be able to follow individual cases.
Usually the path of (a) is followed because of mental laziness of politicians, assumed cost-saving, lobbying by some companies who want to sell their LE Big Data product and BS megalomania. Citizens have to stand up and fight against getting criminalized.
> setting up means for spying on 100% of the people
These means have existed since for ever. Phone taps have been around for as long as phones have existed, way before they became smart. Letters can be opened, everything can be intercepted. Even "pizzino".
It still is. LE barely has enough capacity to fight every criminal, let alone watch 100% of everything everyone does online. And if you look at how tough a time social media are having at content moderation it seems like tools to automate this well don't exist yet. Just look at stories like this:
https://www.washingtonpost.com/blogs/compost/wp/2013/10/15/n...