Earlier quoted context omitted.
Even if you committed a crime, police should not be able to find out about it through illegal means. Police should not be allowed to run SIGINT operations on citizens. They should not even have that capability. Why is it normal for police to have these literal spy movie technologies?
Because people generally wants rulers above them. It is a state doctrine that tells you it is for your protection. But if someone stole your bike, usually police wont find it.
That is a "we're not in a post-scarcity society" problem - stolen bikes tend to be below the cut-off point of cases the police can afford to take on. It's not like they have nothing more important to do.
Unfortunately, there aren't many good solutions to this, and the most direct one involves giving even more spy movie tech to the police, so that bike theft case can be solved with a click of a button - but we probably wouldn't want to live in a world where police can actually do that.