I hope sarcasm is working well for you. To clarify: it would be abused without systems, therefore add court warrants to access any personal information. Criminals are already abusing society by knowing that most of their crime will never be caught.
There is evidence that systems reduce crime, yes. A system is probably the only thing which has ever meaningfully reduced crime. A law. A strategy. A process. I think you're meaning digital systems though. I'd say digital systems are part of every system now.
