Because it's the law. They must be secured and not just slipped over the pedal. It may not move now, but when the rubber ages a bit and softens up you might go for the pedal one day and find yourself pushing the floor instead. There have been documented cases of accidents being caused because of this with some of the over the counter cheap alloy look pedal covers. <{POST_SNAPBACK}> that's funny cause I also have a Golf R32 , and the pedals are just slip ons from factory , no bolt holds them on.