Aircraft is a serious industry with serious people. Drones are available in toy stores. With the exception of JANET, every airline in America properly identifies its aircraft both visually and with radio beacon ID. They're two different arenas.

It's harder for the an airspace violator to disable a radio ID beacon on his drone than to just run a Sharpie over a printed identifier.

You'll never stop the hardcore jerks. But you can dissuade the casual jerk from misbehaving. The same way locking your car won't stop a real car thief, but will keep rando handle jigglers from rummaging through your ride.