It's actually worse for selective enforcement. That allows essentially prosecution for nothing against anyone currently out of favor with the powers that be. It

It's actually worse for selective enforcement. That allows essentially prosecution for nothing against anyone currently out of favor with the powers that be. It obscures this deliberate corruption by hiding it behind a veneer of legalism, and allows apologists to claim "if they didn't want to be arrested, they shouldn't have done X". It erodes the idea of laws being backed by justice, and makes them simply another tool of the powerful against the powerless.