Because I have nothing better to do that deliberately hit pot holes and waste my afternoon.The car in front of me obscured the pot hole and there was on coming traffic going the other way, so I couldn't turn out suddenly into their path.
Then you were driving too fast in the parking lot. If you couldn't have stopped in time to hit this pothole, you were driving too fast and too close to the car in front of you, especially knowing that the parking lot was in bad shape to start with.