First off, sorry to hear some pathetic excuse for a person damaged your car, I've had cars vandalised in the past and it made me feel sick at the time.
In all likelihood it probably was some kid who simply needs a flogging, but you would be surprised at who the typical vandal is these days. I was walking home from Killiney DART station just before xmas at around midnight, about 500 metres before I got to my house, I noticed someone crouching down at the wheel of a neighbours Landrover which was parked opposite his house. I initially thought it was the neighbour adjusting his tyre pressures (when you are car mad like me, you sometimes presume people do these kind of things at any time, day or night, cos I do all kind of car related things when the mood takes me). Anyway, as I approached, the guy stood up and started walking off down the road. I thought this was odd so I looked at the wheel as I passed the Landie and it was flat, as was the other wheel on the same side. I thought, what a little pr1ck and decided to follow him, knowing he was most likely from a rougher part of Ballybrack (not too far from Killiney). I caught up to him quietly and followed him step for step about 3 feet behind. He knew I was there and didn't dare turn to face me, after a while he decided to cross the road and I got a look at his face, here was the shocker; he was late 30's - early 40's! I actually got really annoyed to think an adult would do this petty act. So to completely freak him out, I got my mobile out and pretended to call the police while still following him about 10 feet behind. I'm a reasonably big guy and when he turned around to check me out he got quite a start. I continued my ficticious conversation with the police while looking him straight in the eye, saying 'not a problem Garda, I'll hit him a smack if he gets funny with me!', at this point he decided to leg it. As I was in the mood for a little social cleansing I kept pace with him and we moved quickly into deepest Ballybrack, not really an area I wanted to be but in for a penny... to cut a long story short I gave him enough space to think he'd gotten away and saw him go into his own house, complete with a Subaru Vivio in the driveway.
I dropped over to my neighbour the following day and told him what had happened, we both agreed that it was pointless telling the police as no physical damage had been done to the Landie so they wouldn't do anything. So we decided a little 'street justice' would have to be done in return. 5 of us went over to the guys house that night and turned the Vivio onto its roof (no damage, just the inconvenience of finding your car on its roof in your garden in the morning) we also left a note politely asking not to let the air out of neighbouring residents cars in the future. Seems to have worked a treat.