I had an "airmiss" with a large R/C aircraft very early in my flying career - before my first solo - and it was quite a scary experience. Flying Instructor Stogmuller called the Police via Heathrow Approach Radar (nice English Sunday afternoon in the early 70's, those guys had not much to do) and by the next circuit, the miscreants were helping the Plod with their enquiries.
Having seen the damage an Eagle can do to a C150 canopy, I'm not sure Mr Piper had large (6' span) model aircraft in mind when he built the perspex windshield of the Cherokee 140. G-AWBS if I remember correctly!
I'm with the "lock'em up and throw away the key" brigade. No hope of rehab for that little remote pilot.