I feel for ya bro. Someone tried to steal my 89 Katana 1100 back when it was new. They did the same thing, broke the ignition with a screwdriver. Only thing was, I had a Krytonite lock through the rear wheel (which I guess they didn't see) AND an alarm that was motion activited. So the bike wasn't going to go anywhere. So the asshat broke my ignition lock for NOTHING. Cost ME to fix it. Sad news is about 3 years later, someone DID steal it. Couple of guys threw it in the back of a truck and they were gone.
At least you got it back. I never saw my baby again.