Re: "access to retained traffic and location data is extremely useful to the police"
"Basically, they don't want to know about you unless they need to know about you."
Which is exactly as it should be. Let the law enforcement concentrate on the known bad guys instead of messing around with "ooh shiny" levels of data collection, because they can.
Oh look. The murderous dick-in-a-truck in Germany was "known to the authorities" and "slipped off the radar". Again. And again. And again.
If we want to have any pretence of safety, the authorities need to be better funded so they can do a better job with the intelligence they have now, not given new toys and wholly unnecessary new powers that can only serve to make the job that much harder thanks to the signal to noise ratio falling off a cliff.