I would say that our prosecutors are lucky they don't live in such a country, but frankly our prosecutors are a big reason why the USA is not a decent country. The fact that prosecutors can threaten any member of a defendant's family with any number of 3F/d crimes is a big reason they're able to coerce so many plea bargains. If we only had necessary laws that forbid actual crimes, instead of the many shelf-feet of unknowable laws we have, you'd see far more defendants claiming their rights to fair trials. Today's prosecutors probably wouldn't be able to cope, since they'd have to spend their time prosecuting rather than dreaming up new techniques of pretrial coercion.
With respect to invasions by foreign powers, yes. But neither the government nor the police can be expected to actively protect individual citizens. Protection via deterrent forces (e.g. laws against violent crime) is all the police and government can really do. If you want to actively protect yourself and your family, it's your responsibility to do so. Outsourcing that job to the government and police is how we got to a our current state--they can't "protect us" without sufficient power, which we readily handed over.