So essentially they asked for anonymised lists of phones (i.e. not even the actual numbers) that had been in the locations where the suspects had been, then cross-referenced these to find potential suspects, presumably finding some phones that exactly matched the reported movements of the suspects which they then made a second application to de-anonymise. Do people honestly think this is disproportionate for investig…
If your goal is to arrest someone for the crime, then this may be the best way; but if you optimise society for catching criminals you aren't optimising for prosperity, comfort or sustainability. The country with the greatest personal liberty, currently probably the US, is consistently a place that people would choose to live if they had a choice. This is a hint that moving away from personal liberty will end up with…
What's their prison population again?