Because copyright and a whole bunch of legal issues are not always criminal issues, and even when they are, the cops rarely do anything about them. For example, police in the UK have practically abandoned investigating fraud because they're woefully under resourced [...] at least two sets of underfunded law enforcement to collaborate
That sounds like a problem your government should fix, shouldn't they? Guess they are some what pre occupied right now, trying collectively to figure out how to spell the words "Plan B", "problem solving", and "TCB"...