in the next AGM raise the issue and request that CCTV cameras be installed in society premises . security guards can be entrusted with responsibility of keeping a check on miscreants deflating the car tyres , putting scratches on the car etc .
without evidence you cannot point any fingers at any member of the society .
in addition society can pass a resolution that any member found defalting car will be punished with a penalty of Rs 2500 /.
it will act as a deterrent to the miscreants