I don't think anyones saying that the cops were WRONG in defecting defectable cars, but the point is, they have discretionary power, and in this case it should have been used to improve relations with the enthusiast community.
Sure the car might have a front mount and a pod, but the fact that its parked at an organised even, which is run together with the Australian GP, they should let it slide....if they were ripping it up at the car park, then bend them over without lube, but they were simply parked and doing nothing wrong (apart from having a car modified illegally obviously) and we all know that 99.9% of cars on the road can be defected for something.